Friction

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

The amount of friction depends on the weight of the objects pressing together.

• True
• False

The rougher the surface, the faster an object will travel over the surface.

• True
• False

When most objects with smooth surfaces rub, there is less friction.

• True
• False

What does friction produce?

• light
• sound
• heat
• gravity

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

Which of the following would increase the motion of a ball after it is kicked?

• a flat, grassy surface
• a smooth surface sloped uphill
• a smooth surface sloped downhill

Why are new tires on a car better than older, worn tires?

• New tires have less mass than older tires.
• New tires are less affected by gravity than older tires.
• New tires allow the car to travel faster than older tires.
• New tires provide more friction on the road than older tires.

A person is pushing a lawnmower. Which best describes what is occurring?

• Mass is being applied to the lawnmower.
• Force is being applied to the lawnmower.
• There is no friction acting on the lawnmower.
• There is no gravity acting on the lawnmower.