Physics Newtonrsquos LawsMr Foxrsquos Science ClassThe insanity moves on

Newtonrsquos balls anyone

Sir Isaac Newton

The fig newton is not named after him

Was in a heated competition with Robert Hooke over who was better for England

One of the best Scientists to date

Came up with Laws on Motion and mechanics

The Nature of ForceForce ndash a push or a pull

Unbalanced forces ndash cause an object to start moving stop moving or change direction

Balanced forces ndash equal forces acting in opposite directions on an object

Net Force ndash overall force on an object after all the forces are added together

Unbalanced Forces

An unbalanced force acting on an object will change the objectrsquos motion

Balanced ForcesBalanced Forces acting on an object will not change the objectrsquos motion

Newtonrsquos First Law of MotionInertia ndash the tendency of an object to resist

change in itrsquos motion

Newtonrsquos first law states - An object at rest will stay at rest or an object in motion will stay in motion unless acted upon by another unbalanced force

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Sir Isaac Newton

The fig newton is not named after him

Was in a heated competition with Robert Hooke over who was better for England

One of the best Scientists to date

Came up with Laws on Motion and mechanics

The Nature of ForceForce ndash a push or a pull

Unbalanced forces ndash cause an object to start moving stop moving or change direction

Balanced forces ndash equal forces acting in opposite directions on an object

Net Force ndash overall force on an object after all the forces are added together

Unbalanced Forces

An unbalanced force acting on an object will change the objectrsquos motion

Balanced ForcesBalanced Forces acting on an object will not change the objectrsquos motion

Newtonrsquos First Law of MotionInertia ndash the tendency of an object to resist

change in itrsquos motion

Newtonrsquos first law states - An object at rest will stay at rest or an object in motion will stay in motion unless acted upon by another unbalanced force

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

The Nature of ForceForce ndash a push or a pull

Unbalanced forces ndash cause an object to start moving stop moving or change direction

Balanced forces ndash equal forces acting in opposite directions on an object

Net Force ndash overall force on an object after all the forces are added together

Unbalanced Forces

An unbalanced force acting on an object will change the objectrsquos motion

Balanced ForcesBalanced Forces acting on an object will not change the objectrsquos motion

Newtonrsquos First Law of MotionInertia ndash the tendency of an object to resist

change in itrsquos motion

Newtonrsquos first law states - An object at rest will stay at rest or an object in motion will stay in motion unless acted upon by another unbalanced force

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Unbalanced Forces

An unbalanced force acting on an object will change the objectrsquos motion

Balanced ForcesBalanced Forces acting on an object will not change the objectrsquos motion

Newtonrsquos First Law of MotionInertia ndash the tendency of an object to resist

change in itrsquos motion

Newtonrsquos first law states - An object at rest will stay at rest or an object in motion will stay in motion unless acted upon by another unbalanced force

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Balanced ForcesBalanced Forces acting on an object will not change the objectrsquos motion

Newtonrsquos First Law of MotionInertia ndash the tendency of an object to resist

change in itrsquos motion

Newtonrsquos first law states - An object at rest will stay at rest or an object in motion will stay in motion unless acted upon by another unbalanced force

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Newtonrsquos First Law of MotionInertia ndash the tendency of an object to resist

change in itrsquos motion

Newtonrsquos first law states - An object at rest will stay at rest or an object in motion will stay in motion unless acted upon by another unbalanced force

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Mass vs InertiaAmount of Inertia depends on the mass of the

object

The more mass an object has the more resistant to change in motion the object is going to have

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Newtonrsquos Second Law of MotionThe net force on an object is equal to the

product of its acceleration and its mass OR

Force = Mass x Acceleration

Units kg x mss or N (for newton)

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Practice ProblemsWhat is the force on a 1000kg elevator

accelerating at 2mss

How much force is needed to accelerate a 55kg runner at 15mss

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

GravityObviously the force that holds us to the

Earth

980665 mss is acceleration due to gravity

How much do you weigh in newtons 1lb = 04536kg

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Gravity ConfusionIf two objects of different masses are

dropped in a vacuum they would hit the ground at the same time

If one object is dropped straight down and another shot forward they will still hit the ground at the same time ( I will prove this on Monday )

So why donrsquot a leaf and an acorn hit the ground at the same time when they both drop at the same time

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

WeightRemember weight is caused by gravity

Everything has mass but only objects that are being pulled by gravity have weight Weight = Mass x (Acc Due to gravity)

How much would you weigh on the moon (Gravity = 165mss)

How much would you weigh on Jupiter (Gravity = 2593 mss)

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

FrictionThe force that one surface exerts on another

when the two rub against each other

The strength depends on the type of surface and how hard the surfaces are pushed together

Is friction useful

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Types of FrictionSliding Friction ndash when solid surfaces slide

over each other

Rolling Friction ndash when an object rolls over a surface

Fluid friction ndash friction that occurs when an object moves through a fluid

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Air ResistanceObjects falling through air experience fluid

friction

The greater the surface area an object has the more air resistance it encounters

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Newtonrsquos 3rd Law of MotionIf one object exerts a force on another object

then the second object exerts a force of equal strength in the opposite direction on the first object

For every reactionhellip there is an equal and opposite reaction

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

MomentumExplains why someone would want to catch a

baseball at 90mph rather than a car at 90mph

Momentum = Mass x Velocity

kg ms

No fancy unit name Think of momentum as damage

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice

Practice1 If a car with a mass of 500kg has an acceleration

of 120mss How much force is acting upon the car

2 Mr Fox is exerting a force of 3135N We know he has a mass of 122kg How much is he accelerating

3 An unknown object has a mass of 014kg and a velocity of 424688ms Another unknown has a mass of 0042kg and a velocity of 935ms Which has more momentum Which one would cause more damage What do you think the two objects are

• Physics Newtonrsquos Laws
• Sir Isaac Newton
• The Nature of Force
• Unbalanced Forces
• Balanced Forces
• Newtonrsquos First Law of Motion
• Mass vs Inertia
• Newtonrsquos Second Law of Motion
• Practice Problems
• Gravity
• Gravity Confusion
• Weight
• Friction
• Types of Friction
• Air Resistance
• Newtonrsquos 3rd Law of Motion
• Momentum
• Practice