B) at all.

C) both of these

D) none of these

1. If you push an object twice as far while applying the same force you do E) twice as much work.

F) four times as much work.

G) the same amount of work.

2. If you push an object just as far while applying twice the force you do H) twice as much work.

I) four times as much work.

J) the same amount of work.

3. If you push an object with twice the work input for twice the time, your power input is K) twice.

L) four times as much.

M) the same amount as for half the work in half the time.

4. A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of N) energy. B) power. C) both of these. D) none of these.

5. If you do work on an object in half the usual time, your power output is O) half the usual power output.

P) the usual power output.

Q) twice the usual power output.

6. Exert 1 N for a distance of 1 m in 1 s and you deliver a power of R) 1 W.

S) 2 W.

T) 1/3 W.

U) 3 W.

V) none of these.

7. Do 100 J of work in 50 s and your power output is

W) 1/4 W.

X) 1/2 W.

Y) 2 W.

Z) 4 W.

[) more than 4 W.

8. When an object is raised above the ground it gains a certain amount of potential energy. If the same object is raised twice as high it gains \) four times as much potential energy.

]) twice as much potential energy.

^) neither of these.

9. When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy gain is _) less.

`) the same.

a) twice as much.

b) four times as much.

c) more than 4 times as much.

10. A 1000-kg car and a 2000-kg car are hoisted the same distance in a gas station. Raising the more massive car requires d) less work.

e) as much work.

f) twice as much work.

g) four times as much work.

h) more than 4 times as much work.

11. An object that has kinetic energy must be

i) moving.

j) falling.

k) at an elevated position.

l) at rest.

m) none of these.

12. An object that has potential energy may have this energy because of its n) speed.

o) acceleration.

p) momentum.

q) location.

r) none of these.

13. Bullets are fired from an airplane in the forward direction of motion. The momentum of the airplane will be s) decreased. B) unchanged. C) increased.

14. A clerk can lift containers a vertical distance of 1 meter or can roll them up a 2 meter-long ramp to the same elevation. With the ramp, the applied force required is about t) half as much. B) twice as much. C) the same.

15. A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy of u) less than 40 J. B) more than 40 J. C) 40 J.

16. No work is done by gravity on a bowling ball that rolls along a bowling alley because v) no force acts on the ball.

w) no distance is covered by the ball.

x) the force on the ball is at right angles to the ball's motion. y) no potential energy is being converted to kinetic energy. z) its kinetic energy remains constant.

17. Which requires more work: lifting a 50-kg sack vertically 2 meters or lifting a 25-kg sack vertically 4 meters? {) lifting the 50-kg sack

|) lifting the 25-kg sack

}) Both require the same amount of...