physical science ch 3

11) If you push for an hour against a stationary wall, you do no work A) on the wall. B) at all. C) both D) none of the above

A

15) An object may have potential energy because of its A) location. B) speed. C) momentum. D) acceleration. E) none of the above

A

16) A bow is drawn so that it has 40 J of potential energy. When the arrow is fired its kinetic energy is ideally A) 40 J. B) less than 40 J. C) more than 40 J.

A

19) A hydraulic press properly arranged, like a simple lever, is capable of multiplying energy input. A) false B) sometimes true C) true

A

3) The distinction between impulse and force involves the A) time the force acts. B) mass and its effect on resisting a change in momentum. C) distance the force acts. D) difference between acceleration and velocity.

A

5) In order to catch a fast-moving softball with your bare hand, you extend your hand forward just before the catch and then let the ball ride backward with your hand. Doing this reduces the catching force because the A) time of catch is increased. B) relative velocity is less. C) relative velocity is more. D) time of the catch is decreased. E) none of the above

A

9) When a cannon fires a cannonball at a given speed, the smaller recoil speed of the cannon is due to different A) masses. B) times. C) forces. D) momenta.

A

1) A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is A) unchanged. B) doubled. C) zero. D) quadrupled.

B

10) A cannonball fired from a long- barrel cannon will have a greater muzzle velocity because the cannonball receives a greater A) force. B) impulse. C) both D) neither

B

12) If you push an object twice as far while applying the same force, you do A) four times as much work. B) twice as much work. C) the same amount of work.

B

13) When you push an object a certain distance while applying twice the force, you do A) four times as much work. B) twice as much work. C) the same amount of work.

B

17) If you do work on an object in half the time, your power output is A) half. B) twice. C) the same.

B

18) A simple machine CANNOT multiply A) distance. B) energy. C) force. D) none of the above

B

20) When a simple machine multiplies force, it decreases A) potential energy. B) distance moved. C) both D) neither

B

6) When you are in the way of a fast- moving object and canʹ t get escape, you will suffer a smaller force if the collision time is A) short. B) long. C) the same way either way.

B

7) Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of A) lesser impulse in stopping. B) longer time to stop. C) both D) neither

B

8) A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force to stop the car, the force needed to stop the truck is A) smaller. B) greater. C) the same.

B

2) A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater A) acceleration. B) speed. C) momentum. D) all of the above E) none of the above

C

4) It is correct to say that impulse is equal to A) momentum. B) the force multiplied by the distance the force acts. C) the change in momentum. D) all of the above E) none of the above

C

14) A moving object has A) energy. B) velocity. C) momentum. D) speed. E) all of the above

E