Question 1

An object has gravitational potential energy due to its

Accepted Answer

A) speed. 
B) acceleration. 
C) momentum. 
D) location. 
E) none of the above 
A) speed. 
B) acceleration. 
C) momentum. 
D) location. 
E) none of the above

Question 2

A cannonball has more kinetic energy than the recoiling cannon from which it is fired because the force on the ball

Accepted Answer

A) is more concentrated. 
B) meets less resistance than the cannon on the ground. 
C) acts over a longer distance. 
A) is more concentrated. 
B) meets less resistance than the cannon on the ground. 
C) acts over a longer distance.

Question 3

The ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. The distance that the beam sinks into the ground depends on the

Accepted Answer

A) initial height of the ram. 
B) initial potential energy of the ram. 
C) kinetic energy of the ram when it first hits the beam. 
D) all of the above 
A) initial height of the ram. 
B) initial potential energy of the ram. 
C) kinetic energy of the ram when it first hits the beam. 
D) all of the above

Question 4

Two identical arrows, one with twice the kinetic energy of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

Accepted Answer

A) the same distance. 
B) twice as far. 
C) four times as far. 
D) more than four times as far. 
E) none of the above 
A) the same distance. 
B) twice as far. 
C) four times as far. 
D) more than four times as far. 
E) none of the above

Question 5

A bicycle that travels twice as fast as another when braking to a stop will skid

Accepted Answer

A) twice as far. 
B) four times as far. 
C) eight times as far 
D) sixteen times as far. 
E) depends on the bike's mass 
A) twice as far. 
B) four times as far. 
C) eight times as far 
D) sixteen times as far. 
E) depends on the bike's mass

Question 6

The work you do when pushing a shopping cart twice as far while applying twice the force is

Accepted Answer

A) half as much. 
B) twice as much. 
C) four times as much. 
D) the same amount. 
A) half as much. 
B) twice as much. 
C) four times as much. 
D) the same amount.

Question 7

An object that has kinetic energy must be

Accepted Answer

A) moving. 
B) falling. 
C) at an elevated position. 
D) at rest. 
E) none of the above 
A) moving. 
B) falling. 
C) at an elevated position. 
D) at rest. 
E) none of the above

Question 8

Although perpetual motion is the natural order of things in the universe

Accepted Answer

A) it follows that machines can operate and do work by perpetual motion. 
B) no perpetual-motion device that multiplies energy exists. 
C) both of these are false statements 
A) it follows that machines can operate and do work by perpetual motion. 
B) no perpetual-motion device that multiplies energy exists. 
C) both of these are false statements

Question 9

A machine that promises more energy output than input is

Accepted Answer

A) a fantasy. 
B) commonplace in today's technology. 
C) a long-shot worth investing in. 
A) a fantasy. 
B) commonplace in today's technology. 
C) a long-shot worth investing in.

Question 10

Compared to the recoiling cannon, a fired cannonball has a

Accepted Answer

A) greater momentum. 
B) greater kinetic energy. 
C) smaller speed. 
D) all of the above 
A) greater momentum. 
B) greater kinetic energy. 
C) smaller speed. 
D) all of the above

Question 11

If the speed of a bicycle is reduced to half before skidding to a stop, it will skid

Accepted Answer

A) one-eighth as far. 
B) one-fourth as far. 
C) one-half as far. 
D) none of the above 
A) one-eighth as far. 
B) one-fourth as far. 
C) one-half as far. 
D) none of the above

Question 12

A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is

Accepted Answer

A) 10%. 
B) 20%. 
C) 50%. 
D) 80%. 
E) need more information 
A) 10%. 
B) 20%. 
C) 50%. 
D) 80%. 
E) need more information

Question 13

Which has greater kinetic energy?

Accepted Answer

A) a car traveling at 30 km/hr 
B) a car of half the mass traveling at 60 km/hr 
C) both the same 
D) need more information 
A) a car traveling at 30 km/hr 
B) a car of half the mass traveling at 60 km/hr 
C) both the same 
D) need more information

Question 14

A primary difference between momentum and kinetic energy is

Accepted Answer

A) momenta can cancel; kinetic energy cannot. 
B) kinetic energy can cancel; momenta cannot. 
C) either of the above depending on circumstances 
D) none of the above 
A) momenta can cancel; kinetic energy cannot. 
B) kinetic energy can cancel; momenta cannot. 
C) either of the above depending on circumstances 
D) none of the above

Question 15

Which of these is not a form of solar energy?

Accepted Answer

A) wind energy 
B) fossil fuel energy 
C) geothermal energy 
D) hydroelectric power 
A) wind energy 
B) fossil fuel energy 
C) geothermal energy 
D) hydroelectric power

Question 16

A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is

Accepted Answer

A) 6 J. 
B) 8 J. 
C) 32 J. 
D) 80 J. 
E) more than 80 J. 
A) 6 J. 
B) 8 J. 
C) 32 J. 
D) 80 J. 
E) more than 80 J.

Question 17

If the speed of a motor scooter doubles, which of the following also doubles?

Accepted Answer

A) momentum 
B) kinetic energy 
C) acceleration 
D) all of the above 
A) momentum 
B) kinetic energy 
C) acceleration 
D) all of the above

Question 18

A 2500-N pile-driver ram falls 10 m and drives a post 0.1 m into the ground. The average impact force on the ram is

Accepted Answer

A) 2,500 N. 
B) 25,000 N. 
C) 250,000 N. 
D) 2,500,000 N. 
A) 2,500 N. 
B) 25,000 N. 
C) 250,000 N. 
D) 2,500,000 N.

Question 19

A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is

Accepted Answer

A) 10%. 
B) 50%. 
C) 90%. 
D) 110%. 
E) none of the above 
A) 10%. 
B) 50%. 
C) 90%. 
D) 110%. 
E) none of the above

Question 20

A light aluminum ball and a heavy lead ball of the same size roll down an incline. When they are halfway down the incline, they will have identical

Accepted Answer

A) kinetic energies. 
B) potential energies. 
C) momentum. 
D) inertias. 
E) none of the above 
A) kinetic energies. 
B) potential energies. 
C) momentum. 
D) inertias. 
E) none of the above

Exam 7: Energy

An object has gravitational potential energy due to its

A cannonball has more kinetic energy than the recoiling cannon from which it is fired because the force on the ball

The ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. The distance that the beam sinks into the ground depends on the

Two identical arrows, one with twice the kinetic energy of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

A bicycle that travels twice as fast as another when braking to a stop will skid

The work you do when pushing a shopping cart twice as far while applying twice the force is

An object that has kinetic energy must be

Although perpetual motion is the natural order of things in the universe

A machine that promises more energy output than input is

Compared to the recoiling cannon, a fired cannonball has a

If the speed of a bicycle is reduced to half before skidding to a stop, it will skid

A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is

Which has greater kinetic energy?

A primary difference between momentum and kinetic energy is

Which of these is not a form of solar energy?

A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is

If the speed of a motor scooter doubles, which of the following also doubles?

A 2500-N pile-driver ram falls 10 m and drives a post 0.1 m into the ground. The average impact force on the ram is

A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is

A light aluminum ball and a heavy lead ball of the same size roll down an incline. When they are halfway down the incline, they will have identical

About Science

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