Front

What is the force that attracts objects made of iron or steel?

Back

Magnetism

Front

What increases the force of friction when pulling an object up a ramp?

Back

Using a rough surface like sandpaper increases friction.

Front

Why can't a boy lift a box when he pulls upward?

Back

Gravity is stronger than the force he can lift with.

Front

What makes a box filled with books difficult to move?

Back

The box has a lot of mass, so a large force is required.

Front

What can increase the speed of a toy car?

Back

Pushing with greater force can increase the speed.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object.

Front

What is gravity?

Back

Gravity is the force that pulls objects toward the Earth.

Front

What is the relationship between mass and force?

Back

More mass requires more force to move an object.

Front

What happens to an object's motion when a force is applied?

Back

The object will accelerate in the direction of the force.

Front

What is the effect of a smooth surface on friction?

Back

A smooth surface reduces friction.