PS M3 Extra Credit Test Review

An object in motion at a constant velocity will change its motion only if a balanced force acts on it.

• True

• False

In a car crash, inertia could cause you to crash into the windshield.

• True

• False

The greater an object's mass, the weaker the gravitational force on it.

• True

• False

When a ball is dropped, it falls down due to the force of friction.

• True

• False

Pushing a box up a hill, you have to overcome static friction.

• True

• False

A box does not move when you push it because of static friction.

• True

• False

Forces that are equal in size but opposite in direction are called unbalanced forces.

• True

• False

Earth exerts an unbalanced force on a ball thrown into the air.

• True

• False

An object with a mass of 9.0 kg has an acceleration of 3 m/s². The force acting on it is __ N.

When you push downward on Earth to make a pole vault, Earth exerts an equal force on the pole.

• True

• False