science investigations. a push or pull on an object units: newton (n) = 1 kg x m/s 2 net force...

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FORCES AND FRICTION Science Investigations

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Page 1: Science Investigations.  A push or pull on an object  Units: Newton (N) = 1 kg x m/s 2  Net Force (Fnet) : sum of all of the forces that are acting

FORCES AND FRICTIONScience Investigations

Page 2: Science Investigations.  A push or pull on an object  Units: Newton (N) = 1 kg x m/s 2  Net Force (Fnet) : sum of all of the forces that are acting

FORCE

A push or pull on an object Units: Newton (N) = 1 kg x m/s2

Net Force (Fnet) : sum of all of the forces that are acting on an object

Balanced Forces: Fnet = 0 Object is at rest or moving with constant

velocity Unbalanced Forces: Fnet is not equal

to 0, Object is accelerating or decelerating

Page 3: Science Investigations.  A push or pull on an object  Units: Newton (N) = 1 kg x m/s 2  Net Force (Fnet) : sum of all of the forces that are acting

TYPES OF FORCES

Applied – contact force in the direction the object is moving

Tension- caused by a rope, cable, ect., directed away from the object

Friction- opposes the motion of objects, must have contact

Normal- caused by a surface Force of gravity- force at a distance,

caused by attraction between two objects

Page 4: Science Investigations.  A push or pull on an object  Units: Newton (N) = 1 kg x m/s 2  Net Force (Fnet) : sum of all of the forces that are acting

TWO TYPES OF FRICTION

Static Friction of an object at rest Greater than kinetic friction (harder to get

an object moving than to keep it moving) Friction is greatest when surfaces are roughHow can you get a car to move that is stuck in

the snow? Kinetic

Friction of a moving object

Page 5: Science Investigations.  A push or pull on an object  Units: Newton (N) = 1 kg x m/s 2  Net Force (Fnet) : sum of all of the forces that are acting

TYPES OF KINETIC FRICTION

Sliding Two surfaces moving past each other

Rolling Movement of a circular object on a

surface Fluid Friction

Movement of an object through a liquid or gas

Ex. Air resistance