1. Physics Final Exam Review
2019

2. In physics, work is defined as ______
force times time
force divided by distance
distance divided by time
force divided by time
force times distance
force time distance

3. If you lift two loads up one story, how much work do you do compared to lifting just one load up one story?
one quarter as much
one half as much
the same amount
twice as much
four times as much

4. If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
one quarter as much
one half as much
the same amount
twice as much
four times as much

5. If Nellie Newton pushes an object with twice the force for twice the distance, she does
twice the work
the same work
four times the work
eight times the work

6. The unit of work is the
watt
meter
joule
newton
second

7. Power is defined as
force on an object divided by the time the force acts
work done time the time take to do that work
work done on an object divided by the time take to do the work
distance divided by the time take to move that distance
force on an object times the distance the object moves

8. The unit of power is the
newton
meter
joule
second
watt

9. Potential energy is the energy an object has because of its
density
size
location
temperature
speed

10. The amount of potential energy possessed by an elevated object is equal to
the power used to lift it
the distance it is lifted
the force needed to lift it
the work done to lift it
the value of the acceleration due to gravity

11. Kinetic energy of an object is equal to
its mass multiplied by its acceleration squared
one half the product of its mass times its speed squared
its mass multiplied by its speed
one half the produce of its mass times its speed
its mass multiplied by acceleration

12. How much farther will a car traveling at 100 km/h skid than the same car traveling at 50 km/h?
Half as far
the same distance
twice as far
four times as far
five times as far

13. An arrow in a bow has 70 J of potential energy
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot?
0 J
35 J
50 J
70 J
140 J

14. Energy is changed from one form to another with no net loss or gain.
sometimes true
always false
always true

15. As a pendulum swings back and forth
at the endpoints of its swing, its energy is all potential
at the lowest part of its swing, its energy is all kinetic
kinetic energy is transformed into potential energy
potential energy is transformed into kinetic energy
all of the above

16. When a car’s speed triples, its kinetic energy
remains the same
triples
increases by 4 times
increases by 9 times
none of the above

17. A woman can lift barrels a vertical distance of 1 meter or can roll them up a 2-meter long ramp to the same elevation. If she uses the ramp, the applied force required is
¼ as much
½ as much
the same amount
twice as much
four times as much

18. A job is done slowly, and an identical job is done quickly
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of
energy
power
both a and b
none of the above

19. Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack vertically 4 meters?
lifting the 70 kg sack
lifting the 35 kg sack
both require the same amount of work

20. A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is
100 J
more than 100 J
less than 100 J
not enough information given

21. An object that has kinetic energy must be
at rest
falling
moving
elevated

22. An object that has kinetic energy must have
acceleration
a force applied to maintain it
momentum
none of the above

23. Which has greater kinetic energy, a car traveling at 30 km/h or a half-as-massive car traveling at 60 km/h?
the 60 km/h car
the 30 km/h car
both have the same kinetic energy

24. An object at rest may have
energy
speed
velocity
momentum
acceleration
none of the above

25. If an object has kinetic energy, then it also must have
impulse
force
momentum
acceleration
none of the above

26. If the velocity of a moving object doubles, then what else doubles?
acceleration
kinetic energy
momentum
all of the above
none of the above

27. All simple machines ideally work on the principle that
impulse equals momentum change
force equals mass times acceleration
total momentum before a collision equals total momentum after the collision
work input equals work output
kinetic energy transforms into potential energy

28. The ratio of output force to input force of a simple machine is called the
fulcrum
efficiency
pivot point
lever arm
mechanical advantage

29. A pulley system can change the direction of a force multiply the force
increase the amount of work done
both a and b
both b and c

30. The ratio of useful work output to total work input is called the
mechanical advantage
lever arm
pivot point
fulcrum
efficiency

31. A small economy car (low mass) and a limousine (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives more kinetic energy is the
the limo
the small car
neither one-they receive the same amount of KE
neither one

32. How many joules of work are done on a box when a force of 25 N pushes it 3 m?

33. How much power is required to do 40 J of work on an object in 5 seconds?

34. How much work is done on a 60-N box of books that you carry horizontally across a 6-m room?
0 J
6 J
10 J
60 J
360 J

35. How much work is done on a 20-N crate that you lift 2 m?
0 J
1 J
2 J
20 J
40 J

36. How much power is expended if you lift a 60 N crate 10 meters in 1 second?

37. Suppose a moving car has 3000 J of kinetic energy
Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles, how much kinetic energy will it then have?
1000 J
1500 J
3000 J
6000 J
12,000 J

38. It takes 80 J to push a large box 8 m across a floor
It takes 80 J to push a large box 8 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?
8 N
10 N
80 N
640 N
none of the above

39. If Kelly the skater's speed increases so he has three times the momentum, then his kinetic energy increases by
1/3 times
three times
nine times
none of the above. The KE remains the same.

40. A 60-N object moves at 1 m/s. Its kinetic energy is
more than 60 J

41. Sue can easily lift a 45. 0-N rock with the help of a lever
Sue can easily lift a 45.0-N rock with the help of a lever. When she pushes down with 20.0 N of force, she lifts the rock 0.3 meters. How far does she move her arms to do this?
0.3 m
0.7 m
6.0 m
2.3 m
20.0 m

42. A pulley has two supporting strands
A pulley has two supporting strands. In order for it to lift a load 1 meter, the person pulling will have to pull a distance of
¼ meter
½ meter
1 meter
2 meters
4 meters

43. A frictionless inclined plane is 8
A frictionless inclined plane is 8.0 m long and rests on a wall that is 2.0 m high. How much force is needed to push a block of ice weighing N up the plane?
37.5 N
75.0 N
100.0 N
300.0 N
600.0 N

44. A machine puts out 100 watts of power for every 1000 watts put into it
A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is
10%
50%
90%
110%

45. Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
the inside horse
the outside horse
neither, they both have the same linear speed

46. Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
the inside horse
the outside horse
neither, they both have the same angular speed
neither, the have the same angular speed

47. Which of the following is NOT a unit of rotational speed?
meters/sec
revolutions/min
revolutions/sec
rotations/min
rotations/sec

48. What is the direction of the force that acts on clothes in the spin cycle of a washing machine?
inward
down
outward up

49. A tin can whirled on the end of a string moves in a circle because
the can continually pulls on the string
once the can starts moving, that is its natural tendency
there is a force on the can pulling it outward
there is an inward force on the can
all of the above

50. If you whirl a tin can on the end of a string and the string suddenly breaks, the can will
fly directly away from you
fly off tangent to its circular path
fly directly toward you
spiral in toward your hand
spiral away from your hand

51. People in the future may well live inside a rotating space structure that is more than 2 km in diameter. Inside the structure, people on the inside of the outer edge will experience 1 g while people halfway to the axis will experience
2 g
1 g
½ g
¼ g
0 g

52. "Centrifugal forces" are an apparent reality to observers in a reference frame that is
rotating
an inertial reference frame
moving at constant velocity
at rest
none of the above

53. A person weighs less at the equator than at the poles
A person weighs less at the equator than at the poles. The reason for this has to do with the
tidal bulges
influence of the sun, moon, and all the planets
higher temperature at the equator, and expansion of matter
spin of the Earth
none of the above

54. As the rotational speed of a space habitat increases, the weight of people inside
decreases
increases
stays the same

55. A car travels in a circle with constant speed. The net force on the car
is zero because the car is not accelerating
is directed forward, in the direction of travel
is directed toward the center of the curve
none of the above
is directed toward the center of the curve

56. If Earth rotated more slowly about its axis, your weight would
decrease
increase
stays the same

57. A possible space habitat of the future is a cylinder in space rotating about its long axis. What is the relative gravitational field along the axis of the habitat?
¼ g
½ g
¾ g
1 g
0 g

58. A game room in a rotating space habitat is located in a 0. 25-g region
A game room in a rotating space habitat is located in a 0.25-g region. If a person can jump 0.5-m high in a 1-g region, how high can the same person jump in the game room?
0.5 m
2.0 m
4.0 m
8.0 m
more than 8 m

59. Where is the center of gravity of a softball bat located?
exactly halfway along the bat
in the thin handle
in the more massive part of the bat

60. When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows
a regular straight line path
a wobbly path with irregular speed
a straight line path with irregular speed

61. The center of gravity of an object can be located by
balancing it above your finger
looking at the intersection of lines drawn straight down from suspension points
all of the above
none of the above

62. In which of the following is the center of gravity located at a point where there is no mass?
pineapple
cookie
glass of milk
donut
apple

63. When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?
to change the mass of your body
to be ready to grab something in case you fall
to look good
to change the center of gravity of your body and the load
to change the weight of your body and the load
to change the center of gravity of your body and the load

64. The center of mass of the solar system
varies as the planets move
is the center of the Sun
neither a or b

65. The long heavy tail of a spider monkey enables the monkey to easily vary its
center of gravity
weight
momentum
inertia
none of the above

66. The charge of an electron is
positive
negative
no charge

67. Atomic nuclei of almost all elements consist of
only neutrons
protons and electrons
neutrons and electrons
protons and neutrons
only protons

68. Two like charges neutralize each other repel each other
must be neutrons
attract each other
have no effect on each other

69. Protons and electrons attract each other repel each other
do not interact

70. The fundamental force underlying all chemical reactions is
electrical
gravitational
centripetal
nuclear
none of the above

71. Electrical forces between charges are strongest when the charges are
far apart
close together
the electrical force is constant everywhere

72. Coulomb's law says that the force between any two charges depends
directly on the size of the charges
inversely on the square of the distance between the charges
both a and b
none of the above

73. Two charges are separated by a certain distance
Two charges are separated by a certain distance. If the magnitude of each charge is doubled, the force on each charge is
halved
doubled
tripled
quadrupled

74. When the distance between two charges is halved, the electrical force between the charges
doubles
reduces to ¼
reduces to ½
quadruples
none of the above

75. The net charge of a nonionized atom
depends on the number of electrons it has
is zero
usually cannot be determined
depends on the number of protons it has

76. A positive ion has more electrons than protons
more protons than electrons
a +1 charge always
one proton

77. If you comb your hair and the comb becomes positively charged, your hair becomes
uncharged
positively charged
negatively charged

78. Objects can be charged by
induction
friction
touching
all of the above
none of the above

79. To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with
steel
wood
either a or b

80. The SI unit of charge is the
ohm
joule
coulomb
ampere
newton

81. Two charges separated by a distance of 1 meter exert a 2-N force on each other. If the magnitude of each charge is doubled, the force on each charge is
2 N
4 N
8 N
16 N
none of the above