CH 7 Review - Newton's Third Law

Whenever one object exerts a force on a second object, the second object always exerts the same amount of force back on the first object.

• True

• False

A rocketship is pushed forward by gases that are forced out the back of the ship.

• True

• False

In order to make a cart move forward, a horse must pull harder on the cart than the cart pulls on the horse.

• True

• False

If a bicycle and a parked car have a head-on collision, the force of impact is greater on the bicycle.

• True

• False

The earth and moon pull on each other with equal amounts of force.

• True

• False

Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.

• always true

• sometimes true

• always false

A high school student hits a nail with a hammer. During the

collision, there is a force

• on the hammer but not on the nail

• on the nail but not on the hammer

• on the nail AND also on the hammer

A woman weighing 500 N sits on the floor. She exerts a force on the floor of

• 1000N

• 500N

• 250N

• 50N

As a 500 N woman sits on the floor, the floor exerts a force on her of

• 1000N

• 500N

• 250N

• 50N

Forces always occur

• when veloocities are constant

• in single quantities

• in pairs

• in triplets