Projectile motion Projectile motion

The curved path that an object follows when thrown, launched, or otherwise projected

near the surface of the Earth.

The curved path that an object follows when thrown, launched, or otherwise projected

near the surface of the Earth.

Centripetal force: Centripetal force:

An unbalanced force meaning “towards the center” that causes objects to move in a circular path.

An unbalanced force meaning “towards the center” that causes objects to move in a circular path.

Inertia Inertia

The tendency of an object to resist a change in motion until acted on by an unbalanced force.

The tendency of an object to resist a change in motion until acted on by an unbalanced force.

Action/reaction pairs Action/reaction pairs

All forces act in pairsThe action of one object causes the

equal and opposite reaction of the other

All forces act in pairsThe action of one object causes the

equal and opposite reaction of the other

Momentum Momentum

“Mass in motion”; the product of the mass and velocity of an object.

“Mass in motion”; the product of the mass and velocity of an object.

Law of Conservation of Momentum Law of Conservation of Momentum

Any time that objects collide, the total momentum will stay the same

Any time that objects collide, the total momentum will stay the same

Newton’s First Law:

An object at rest will stay at rest and an object in motion will stay in motion until

acted on by an unbalanced force.

Newton’s First Law:

An object at rest will stay at rest and an object in motion will stay in motion until

acted on by an unbalanced force.

Newton’s Second Law: Acceleration depends on force and mass

Newton’s Second Law: Acceleration depends on force and mass

How is it expressed mathematically?

A = F/m

Example : Pushing a shopping cart full of groceries requires more force than an empty cart if you want to keep the acceleration the same

How is it expressed mathematically?

A = F/m

Example : Pushing a shopping cart full of groceries requires more force than an empty cart if you want to keep the acceleration the same

Newton’s Third Law: Newton’s Third Law:

For every action there is an equal and opposite reaction example: rocket

For every action there is an equal and opposite reaction example: rocket

What gives an object in projectile motion it’s vertical motion?

What gives an object in projectile motion it’s vertical motion?

Gravity Gravity

If you are shooting an arrow trying to hit the bulls eye of a target, explain where you must

aim the arrow and why.

If you are shooting an arrow trying to hit the bulls eye of a target, explain where you must

aim the arrow and why. You must aim higher than the bulls

eye because you need to account for gravity impacting the vertical motion and pulling the arrow down.

You must aim higher than the bulls eye because you need to account for gravity impacting the vertical motion and pulling the arrow down.

Provide an example of an object in projectile motion.

Provide an example of an object in projectile motion.

Frog jumping Ball being thrown Bullet being shot

Frog jumping Ball being thrown Bullet being shot

Explain the motion of an unsecured object in a car traveling at 100 miles per hour and the

brakes are suddenly slammed on – use scientific terms we have learned!

Explain the motion of an unsecured object in a car traveling at 100 miles per hour and the

brakes are suddenly slammed on – use scientific terms we have learned!

The object will continue to move forward because of inertia. It will keep moving until acted on by an unbalanced force(like hitting the windshield)

The object will continue to move forward because of inertia. It will keep moving until acted on by an unbalanced force(like hitting the windshield)

Name two factors that influence an object’s inertia.

Name two factors that influence an object’s inertia.

Mass and friction Mass and friction

Calculate the acceleration of a 40 kg object that is pushed with a 2N force.

Calculate the acceleration of a 40 kg object that is pushed with a 2N force.

a = F/m a = 2 kg X m/s2

40 kg a = .05 m/s2

a = F/m a = 2 kg X m/s2

40 kg a = .05 m/s2

Calculate the acceleration of a 80 kg object that is pushed with a 2N force.

Calculate the acceleration of a 80 kg object that is pushed with a 2N force.

a = F/m a = 2 kg X m/s2

80 kg a = .025 m/s2

a = F/m a = 2 kg X m/s2

80 kg a = .025 m/s2

What happens to an object’s acceleration if the mass increases and the force remains the

same?

What happens to an object’s acceleration if the mass increases and the force remains the

same?

Acceleration will increase Acceleration will increase

What happens to an object’s acceleration as the force increases, but the mass remains the

same?

What happens to an object’s acceleration as the force increases, but the mass remains the

same?

Acceleration will increase Acceleration will increase

Provide an example of an action-reaction pair.

Provide an example of an action-reaction pair.

Baseball bat hitting ball Bowling ball hitting pins Rocket blasting off Balloon car moving

Baseball bat hitting ball Bowling ball hitting pins Rocket blasting off Balloon car moving

What can happen to momentum when 2 objects collide?

What can happen to momentum when 2 objects collide?

All or some of the momentum will be transferred to the other object

All or some of the momentum will be transferred to the other object

Which of Newton’s Laws does each of the following examples apply to?

Which of Newton’s Laws does each of the following examples apply to?

1 A bicyclist flying over the handle bars when the brakes are applied suddenly.

3 A rocket blasting off 2 A woman pushing a baby carriage

with a 4 kg baby in it.

1 A bicyclist flying over the handle bars when the brakes are applied suddenly.

3 A rocket blasting off 2 A woman pushing a baby carriage

with a 4 kg baby in it.

Which will require more force to accelerate an object at the same rate, a bowling ball or a

golf ball? Explain why.

Which will require more force to accelerate an object at the same rate, a bowling ball or a

golf ball? Explain why.

A bowling ball will require more force because it has more mass.

A bowling ball will require more force because it has more mass.

If a bus and a bike are traveling with the same velocity do they have the same momentum? Explain your answer.

If a bus and a bike are traveling with the same velocity do they have the same momentum? Explain your answer.

A bus will have more momentum because it has a larger mass than the bike does.

A bus will have more momentum because it has a larger mass than the bike does.

Use Newton’s law of inertia, centripetal force and gravity to explain why planets

orbit the Sun.

Use Newton’s law of inertia, centripetal force and gravity to explain why planets

orbit the Sun.

The inertia that planets have (left over from the big bang) that causes it to “want” t travel away is balanced by the gravitiation force of the Sun which causes a centripetal force and causes the planets to orbit the Sun.

The inertia that planets have (left over from the big bang) that causes it to “want” t travel away is balanced by the gravitiation force of the Sun which causes a centripetal force and causes the planets to orbit the Sun.