Force and Motion

The weight of an object______________

• 1. stays the same wherever the object is.

• 1. changes if the object is in motion.

• 1. stays the same as long as the object is in motion.

• 1. changes if the force of gravity changes.

Distance traveled per unit of time is                .

• 1. velocity

• 1. speed

• 1. motion

• 1. acceleration

As the                 of a moving object increases, so does the kinetic energy.

• height

• mass

• gravity

• weight

Newton's Third Law gets help from the first two laws. Which aspects of those laws are necessary to help explain Newton's Third Law of Motion? Select all answers that apply.

• 1. An object in motion tends to stay in motion

• 1. An object at rest tends to stay at rest

• 1. Force equals mass times acceleration

• 1. The greater the mass is, the greater the force necessary to accelerate that mass is

• 1. For every action, there is an equal and opposite reaction

What is Newton's first law of motion?

• 1. An object will not be in motion until acted on by an unbalanced force.

• 1. An object in motion will continue in motion unless acted on by an unbalanced force

• 1. A body moving moving in a straight line will continue moving in a straight line until disturbed on by an unbalanced force

• 1. None of the above.

Which of the following is a scalar quantity?

• 1. acceleration

• displacement

• distance

• momentum

Morgan has a job working in a mine. She walks up and begins pushing a large rock that is sitting still. After a lot of shoving, she makes it start sliding across the floor. She pushes it to the edge of a cliff where it falls through the air onto a rolling conveyor belt which carries it to a machine to be crushed. At what point did the rock have the strongest friction?

• 1. when it was sitting still

• 1. when Morgan was pushing it

• 1. when it was falling through the air

• 1. when it was rolling on the conveyor belt

Gravity will apply a different amount of force to objects with different mass. The force of gravity can also be called

• weight

• inertia

• mass

• resistance

Ball A is a 1.50 kg ball moving at 8.00 m/s south. It strikes Ball B, a 2.00 kg ball moving at 3.00 m/s south. The velocity of Ball B after the collision is 4.50 m/s south. What is the momentum of Ball B after the collision?

• 9

• 15

• 2.25

• None of the above

The distance and direction of an object's change in position from a reference point is _________

• 1. motion

• 1. acceleration

• 1. displacement

• 1. velocity