Topic Test Answers

Weightlessness occurs when an object applies a reaction force to another object.

An object will accelerate in free fall because the only force acting on it is gravity.

Use the diagram to answer each question.Assume that all of the objects in the diagram are solid and made of the same material.

Explain what happens to a wall if you push on it with a force of 10 N.

Show that the Newton has the units of mass times acceleration.

Explain why an object moves if the action-reaction forces are equal.

The force of gravity between you and Earth is greater than the force of gravity between you and a car because Earth has more ____________________ than the car.

The metric unit that is used to describe weight as a measure of the force of gravity is called a ________________.

When ____________________ equals the force of gravity on a falling object, the object reaches terminal velocity.

Are astronauts really “weightless” while in orbit? Explain why or why not.

Kelly sits on a rock. Her weight is an action force. Describe the reaction force.

Use the diagram to answer each question.Assume that all of the objects in the diagram are solid and made of the same material.

Explain how weight is measured.

The downward force acting on an object in free fall is the force of ____________________.