Question 1

It takes 40 J to push a large box 4 m across a floor.Assuming the push is in the same direction as the move,what is the magnitude of the force on the box?

Accepted Answer

A) 4 N 
B) 10 N 
C) 40 N 
D) 160 N 
E) none of these 
A) 4 N 
B) 10 N 
C) 40 N 
D) 160 N 
E) none of these

Question 2

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

Question 3

Two pool balls,each moving at 2 m/s,roll toward each other and collide.Suppose after bouncing apart,each moves at 4 m/s.This collision violates conservation of

Accepted Answer

A) momentum. 
B) energy. 
C) both momentum and energy. 
D) none of the above choices 
A) momentum. 
B) energy. 
C) both momentum and energy. 
D) none of the above choices

Question 4

When an object is in motion,which of the following could not have a value of zero?

Accepted Answer

A) momentum 
B) kinetic energy 
C) mass 
D) inertia 
E) None of the above could be zero. 
A) momentum 
B) kinetic energy 
C) mass 
D) inertia 
E) None of the above could be zero.

Question 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

Accepted Answer

A) energy. 
B) power. 
C) effort. 
D) none of these 
A) energy. 
B) power. 
C) effort. 
D) none of these

Question 6

If you push an object twice as far while applying the same force,you do

Accepted Answer

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

Question 7

Whereas impulse involves the time that a force acts,work involves the

Accepted Answer

A) distance that a force acts. 
B) time and distance that a force acts. 
C) acceleration that a force produces. 
A) distance that a force acts. 
B) time and distance that a force acts. 
C) acceleration that a force produces.

Question 8

If a ping pong ball and a golf ball are both moving in the same direction with the same amount of kinetic energy,the speed of the ping pong ball must be

Accepted Answer

A) less than the golf ball. 
B) more than the golf ball. 
C) the same as the golf ball. 
D) impossible to predict without additional information 
A) less than the golf ball. 
B) more than the golf ball. 
C) the same as the golf ball. 
D) impossible to predict without additional information

Question 9

A piece of taffy slams into and sticks to another identical piece of taffy that is at rest.The momentum of the two pieces stuck together after the collision is the same as it was before the collision,but this is not true of the kinetic energy,which is partly turned into heat.What percentage of the kinetic energy is turned into heat?

Accepted Answer

A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) not enough information given 
A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) not enough information given

Question 10

A motorcycle with a mass of 100 kilograms slowly rolls over the edge of a cliff and falls for three seconds before it reaches the bottom of a gully.Its momentum (in units of kilogram meters per second)just before it hit bottom and became burned rubber and scrap metal was

Accepted Answer

A) 1,000. 
B) 2,000. 
C) 3,000. 
D) 4,000. 
E) 9,000. 
A) 1,000. 
B) 2,000. 
C) 3,000. 
D) 4,000. 
E) 9,000.

Question 11

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground.The amount of energy converted to heat is about

Accepted Answer

A) 0)5 J. 
B) 1)0 J. 
C) 1)5 J. 
D) 2)0 J. 
E) more than 2.0 J. 
A) 0)5 J. 
B) 1)0 J. 
C) 1)5 J. 
D) 2)0 J. 
E) more than 2.0 J.

Question 12

A car's engine is 20% efficient.When cruising,the car encounters an average retarding force of 1000 N.If the energy content of gasoline is 40 megajoules per liter,how many kilometers per liter does the car get?

Accepted Answer

A) 14 
B) 12 
C) 10 
D) 8 
E) none of these 
A) 14 
B) 12 
C) 10 
D) 8 
E) none of these

Question 13

A block of ice sliding down an incline has its maximum speed at

Accepted Answer

A) the top. 
B) the bottom. 
C) halfway down. 
D) difficult to predict without knowing the slope of the incline 
E) difficult to predict without knowing the coefficient of friction 
A) the top. 
B) the bottom. 
C) halfway down. 
D) difficult to predict without knowing the slope of the incline 
E) difficult to predict without knowing the coefficient of friction

Question 14

Two identical 5000-kg bulldozers roll toward each other on a level road without friction (one at 1 m/s,the other at 2 m/s)Just before they collide,one has a kinetic energy of 2500 J and the other 10,000 J.At this instant their total kinetic energy is

Accepted Answer

A) 1250 J. 
B) 2500 J. 
C) 7500 J. 
D) 10,000 J. 
E) 12,500 J. 
A) 1250 J. 
B) 2500 J. 
C) 7500 J. 
D) 10,000 J. 
E) 12,500 J.

Question 15

Which has greater kinetic energy,a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr?

Accepted Answer

A) the 30 km/hr car 
B) the 60 km/hr car 
C) Both have the same kinetic energy. 
D) More information is needed about the distance traveled. 
A) the 30 km/hr car 
B) the 60 km/hr car 
C) Both have the same kinetic energy. 
D) More information is needed about the distance traveled.

Question 16

A hydraulic press,like an inclined plane,is capable of increasing energy.

Accepted Answer

A) sometimes true 
B) always false 
C) always true 
D) sometimes false 
A) sometimes true 
B) always false 
C) always true 
D) sometimes false

Question 17

Two identical arrows,one with twice the speed of the other,are fired into a hay bale.The faster arrow will penetrate

Accepted Answer

A) the same distance as the slower arrow. 
B) two times further than the slower arrow. 
C) four times further than the slower arrow. 
D) more than four times further than the slower arrow. 
E) none of these 
A) the same distance as the slower arrow. 
B) two times further than the slower arrow. 
C) four times further than the slower arrow. 
D) more than four times further than the slower arrow. 
E) none of these

Question 18

If you push for a half hour or a whole hour against a stationary wall

Accepted Answer

A) no work on the wall is done in either case. 
B) half as much work is done during the half hour. 
C) twice as much work is done during the half hour. 
D) it is impossible to determine how much work is done. 
A) no work on the wall is done in either case. 
B) half as much work is done during the half hour. 
C) twice as much work is done during the half hour. 
D) it is impossible to determine how much work is done.

Question 19

A car moves 4 times as fast as another identical car.Compared to the slower car,the faster car has

Accepted Answer

A) 4 times the KE. 
B) 8 times the KE. 
C) 12 times the KE. 
D) 16 times the KE. 
A) 4 times the KE. 
B) 8 times the KE. 
C) 12 times the KE. 
D) 16 times the KE.

Question 20

A light aluminum ball and a heavy lead ball of the same size are allowed to 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 choices 
A) kinetic energies. 
B) potential energies. 
C) momentum. 
D) inertias. 
E) none of the above choices

Exam 7: Energy

It takes 40 J to push a large box 4 m across a floor.Assuming the push is in the same direction as the move,what is the magnitude of the force on the box?

An object that has kinetic energy must be

Two pool balls,each moving at 2 m/s,roll toward each other and collide.Suppose after bouncing apart,each moves at 4 m/s.This collision violates conservation of

When an object is in motion,which of the following could not have a value of zero?

A job is done slowly,while an identical job is done quickly.Both jobs require the same amount of work,but different amounts of

If you push an object twice as far while applying the same force,you do

Whereas impulse involves the time that a force acts,work involves the

If a ping pong ball and a golf ball are both moving in the same direction with the same amount of kinetic energy,the speed of the ping pong ball must be

A motorcycle with a mass of 100 kilograms slowly rolls over the edge of a cliff and falls for three seconds before it reaches the bottom of a gully.Its momentum (in units of kilogram meters per second)just before it hit bottom and became burned rubber and scrap metal was

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground.The amount of energy converted to heat is about

A car's engine is 20% efficient.When cruising,the car encounters an average retarding force of 1000 N.If the energy content of gasoline is 40 megajoules per liter,how many kilometers per liter does the car get?

A block of ice sliding down an incline has its maximum speed at

Two identical 5000-kg bulldozers roll toward each other on a level road without friction (one at 1 m/s,the other at 2 m/s)Just before they collide,one has a kinetic energy of 2500 J and the other 10,000 J.At this instant their total kinetic energy is

Which has greater kinetic energy,a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr?

A hydraulic press,like an inclined plane,is capable of increasing energy.

Two identical arrows,one with twice the speed of the other,are fired into a hay bale.The faster arrow will penetrate

If you push for a half hour or a whole hour against a stationary wall

A car moves 4 times as fast as another identical car.Compared to the slower car,the faster car has

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

About Science

Newtons First Law of Motion: Inertia

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Atomic Nature of Matter

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