Forces

Front

What is friction?

Back

Friction is a force that opposes the motion of an object when it comes into contact with another surface.

Front

Which surface has the greatest amount of friction: gravel, sand, grass, or sidewalk?

Back

Gravel has the greatest amount of friction.

Front

True or False: Friction can speed up moving objects.

Back

False. Friction opposes motion and can slow down moving objects.

Front

What is the change in an object's position called?

Back

Motion.

Front

What factors can affect the amount of friction between two surfaces?

Back

The texture of the surfaces, the weight of the objects, and the presence of lubricants.

Front

In an experiment to measure force needed to move blocks of wood, what should change in each trial?

Back

The type of surface (e.g., rough, smooth) on which the blocks are moved.

Front

What is the effect of friction on a toy car rolling on different surfaces?

Back

Friction affects the speed and distance the toy car can roll.

Front

What is the relationship between surface texture and friction?

Back

Rougher surfaces generally produce more friction than smoother surfaces.

Front

How does weight affect friction?

Back

Increased weight typically increases the amount of friction between two surfaces.

Front

What is static friction?

Back

Static friction is the force that keeps an object at rest and prevents it from starting to move.