# Physics Questions

Topics: Kinetic energy, Potential energy, Energy Pages: 18 (4117 words) Published: February 9, 2013
MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 1)  If you push for an hour against a stationary wall, you do no work  A) on the wall. B)  at all. C)  both of these D)  none of these

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

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

4)  If you push an object with twice the work input for twice the time, your power input is  A) twice.
B) four times as much.
C) the same amount as for half the work in half the time.

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

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

7)  Exert 1 N for a distance of 1 m in 1 s and you deliver a power of  A) 1 W.
B) 2 W.
C) 1/3 W.
D) 3 W.
E) none of these.

8)  Do 100 J of work in 50 s and your power output is
A) 1/4 W.
B) 1/2 W.
C) 2 W.
D) 4 W.
E) more than 4 W.

9)  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  A) four times as much potential energy.
B) twice as much potential energy.
C) neither of these.

10)  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  A) less.
B) the same.
C) twice as much.
D) four times as much.
E) more than 4 times as much.

11)  A 1000-kg car and a 2000-kg car are hoisted the same distance in a gas station. Raising the more massive car requires  A) less work.
B) as much work.
C) twice as much work.
D) four times as much work.
E) more than 4 times as much work.

12)  An object that has kinetic energy must be
A) moving.
B) falling.
C) at an elevated position.
D) at rest.
E) none of these.

13)  An object that has potential energy may have this energy because of its  A) speed.
B) acceleration.
C) momentum.
D) location.
E) none of these.

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

15)  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  A) half as much. B)  twice as much. C)  the same.

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

17)  When a car is braked to a stop, its kinetic energy is transformed to  A) stopping energy.
B) potential energy.
C) energy of motion.
D) energy of rest.
E) heat.

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

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

A marble is rolling back and forth along the path shown.

Figure 7-A

20)  At position A, is the marble's kinetic energy less than, greater than, or the same as its kinetic energy when it is at B?  A) less B)  greater C)  the same

A small ball tied to a string swings without air resistance, beginning from rest at point A.  The string snags on a nail at point P, causing the ball to move in a small circle.

Figure 7-B

21)  The ball has maximum potential energy at point
A) A. B) ...