Download PhysicsMCExamReview-SPG2015

SPG Review 2015
Name _________________________
1. The slope of a distance vs. time graph will yield which of the following quantities?
A. displacement
B. acceleration
C. distance
D. velocity
2. A car traveling at constant velocity will experience
A. acceleration
B. deceleration
C. no acceleration D. none of the above
3. Which of the following objects will air resistance have to be considered in the calculations of
vertical motion? A. large rock
B. baseball
C. ping pong ball
D. car
4. If the graph of a velocity-time curve lies parallel to the time axis, (see below) what can be
determined about the acceleration of the object?
A. It is constant
B. It is zero
C. It is positive
D. It is negative
Velocity
(m/s)
Time
(s)
5. The acceleration due to gravity has different values at different places on the Earth. A.True B. False
6. A vector that represents the sum of two or more other vectors is the ________.
a. resultant
b. component
c. scalar
d. vector
7. When you are driving and look at the dashboard to check how fast you are going, you are
checking your A. average speed B. acceleration C. instantaneous speed D. velocity
8. The rate at which distance is covered is known as _________________.
A. acceleration
B. Average acceleration
C. speed
D. gravity
9. An object is most likely ______________ if it is only changing direction.
A. speeding
B. accelerating
C. stopping
D. falling
10. An object is thrown upward with an initial speed of 6 m/s. The speed of the object at the top of
its path is
A. 6 m/s
B. 0 m/s
C. –6 m/s
D. 10 m/s2
11. The magnitude of the acceleration of the object in #17, at the top of its path, is approximately
_.
A. 6 m/s
B. 10 m/s
C. –6 m/s
D. 10 m/s2
12. The object in #17 will be moving at what speed when it comes back to the level from which it
was thrown?
A. 6 m/s
B. 0 m/s
C. 6 m/s2
D. 10 m/s2
13. For an object moving along a trajectory, the horizontal acceleration of the object _____ as the
position changes. a. increases
b. decreases
c. is constant
14. The vertical change in position of an object that is dropped and that of an identical object that is
thrown horizontally from the same height . . .
a. . . . is the same
b. . . . is greater for the thrown object
c. . . . is less for the thrown object
d. . . . depends on the initial velocities of the objects
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15. In trajectory motion, the initial horizontal velocity is _______ the final horizontal velocity.
a. greater than
b. less than
c. equal to
16. For a ball thrown up into the air, providing the launching and landing positions for the ball are
the same, the time the ball rises is ________ the time it takes to fall.
a. less than
b. greater than
c. equal to
d. not enough information
17. The parabolic path that an object follows under the influence of gravity is called the ______.
a. range
b. trajectory
c. projectile
d. y-max
18. The velocity in the y-direction at the top of the path of a projectile is _____
a. at its maximum
b. half of the initial velocity
c. zero
19. As a projectile travels upward, its vertical speed _________.
a. increases
b. decreases
c. remains constant
d. none of the above
20. In the absence of air, which of the following objects will fall faster on Earth?
a. a bowling ball
b. a baseball
c. a feather
d. both a and b because they are heavier d. they will all fall at the same rate
21. The horizontal component of velocity does not depend on gravity.
a. TRUE
b. FALSE
22. When one force exerts a force on a second object, the second object exerts a force on the first
object that is equal in magnitude but opposite in direction is a statement of
a. kinematics b. Newton’s second law
c. Newton’s third law
d. net force
23. The acceleration of an object is directly proportional to the net force on it and inversely
proportional to it’s mass is a statement of
a. kinematics b. Newton’s second law
c. Newton’s third law
d. net force
24. An object with no net force acting on it remains at rest or moves at constant velocity in a
straight line is a statement of
a. Newton’s 1st Law
b. Newton’s second law
c. Newton’s third law
d. net force
25. The acceleration produced by a net force on an object is
a. directly proportional to the mass
b. in the opposite direction of the force
c. directly proportional to the force
d. all of the above
26. After a cannon ball is fired into space (include air resistance) the force required to keep it in
motion is
a.zero
b. 9.8 m/s2
c. equal to the drag force or air resistance
d. twice the force with which it was fired
27. If the force on a cart is reduced by a factor of 4 (1/4 of the original force), what happens to the
acceleration on the cart?
a. it is 4 times
b. it doubles
c. it halves
d. it is ¼ as much
28. A 10 kg box is being pushed across the floor at a constant velocity of 5 m/s. What is the net
force acting on the box?
a. 50 N
b. 2 N
c. 0.5 N
d. 0 N
29. A push or a pull on an object is called ___________.
a. weight
b. Force
c. gravity
d. acceleration
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30. The gravitational force exerted between two bodies is called _____________.
a. weight
b. Force
c. gravity
d. acceleration
31. Jessica has a mass of 65 kg on Earth. She travels to Jupiter, where the acceleration due to
gravity is 27 m/s2. What is Jessica’s mass on Mars?
a. 1,755 N
b. 27 m/s2
c. 65 kg
d. 2.41 kg
32. A girl on ice skates throws a book bag straight out in front of herself. Which of Newton’s laws
explains her motion backwards?
a. Newton’s 1st law
b. Newton’s 2nd law
c. Newton’s 3rd law
33. The difference in the acceleration of a cannon ball and a cannon after firing is best explained by
which of Newton’s laws?
a. Newton’s 1st law
b. Newton’s 2nd law
c. Newton’s 3rd law
34. An object is traveling at a constant velocity. Therefore, it will have . . .
a. infinite force exerted on it.
b. No acceleration
c. No net force exerted on it.
d. Both a and c
e. Both b and c
35. If the force on an object remains constant while the mass decreases (such as in a rocket burning
its fuel), then what can be said of the acceleration?
a. goes to zero
b. remains constant
c. decreases
d. increases
36. The term “vector sum” is another name for __________.
a. resultant
b. component
c. scalar
d. vector
37. Two perpendicular vectors that can be used to represent a single vector are the __________ of
that vector. a. resultants
b. components
c. scalars
d. tangents
38. Kinetic energy is the energy of motion an object has while moving. a. True
39. As the velocity decreases, the kinetic energy
a. Increases
b. decreases
c. remains the same
b. false
d. doubles
40. For a pendulum, the energy can shift from potential to kinetic and back again. a.True b. false
41. The law of conservation of energy tells us that the total energy of an operating system is:
a. constant
b. changing
c. none of the above
42. Energy can change form, but is not created nor destroyed is also a part of the:
a. Law of conservation of matter
b. Law of conservation of energy
c. Einstein’s Law of Gravity
d. Newton’s Law of motion
43. Spiderman is on top of a building and has 800 J of potential energy. He jumps off of the
building and ¼ of the way from the top, how much potential energy does he have?
a. 800 J
b. 400 J
c. 200 J
d. 100 J e. 600 J
44. As the height is increased, the potential energy of an object:
a. increases
b. remains the same c. decreases
d. doubles
45. Energy can be _____________ from one form to another.
a. destroyed
b. created
c. captured by aliens d. converted or changed
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46. The force of friction on an object acts in the ____________ direction as the applied force .
a. opposite
b. same
c. perpendicular
47. As the normal force increases, the force of friction ________________.
a. remains the same b. decreases
c. increases
d. none of the above
48. The coefficient of friction is a ratio of the friction force to the normal force. a. true
b. false
49. An object on an incline will have ___ normal force than the same object on a horizontal surface.
a. less
b. more
c. same
d. none of the above
50. The product (multiplying) mass and velocity will determine the ___________ of an object.
a. force
b. acceleration
c. energy
d. momentum
51. As the mass of a moving object increases, the potential and kinetic energy will __________.
a. remains the same b. decreases
c. increases
d. none of the above
52. A 5000 kg truck is moving at 20 m/s and a 2000 kg car is traveling at 25 m/s. Which one has
more momentum?
a. truck
b. car
53. A 20,000 kg train car is moving at 10 m/s. It joins with another car of the same mass and they
both move off together at 4 m/s. Which of the following laws explains this motion?
a. Conservation of Newton’s 1st Law
b. Newton’s 3rd Law
c. Conservation of momentum
d. Conservation of mass
54. In what direction does centripetal force point?
a) toward the center
b) outwards
c) tangent to the circle
d) nowhere
55. As a car goes around a left turn, the passenger feels squished toward the door of the car. What
causes his body to move away from the center of the curve?
a) Newton’s First Law of Inertia.
b) Gravity
c) Centrifugal force
d) Friction
56. What quantities can affect the torque of a rotating object?
a. applied force
b. lever arm distance
c. both a and b
d. neither a nor b
57. What would happen to the gravitational force felt between two objects if the radius between
them were doubled?
a) Fg would double
b) Fg would cut in half
c) Fg would be divided by four
d) Fg would stay the same
58. What quantities can affect the impulse of an object?
a. force b. time
c velocity d. all of these e. none of these
59. In which of the following cases is the greatest impulse exerted?
a) A 100 N force acts for 10 seconds
d) A 20 N force acts for 1 minute
b) A 200 N force acts for 3 seconds
e) All four of these impulses are identical
c) A 50 N force acts for 15 seconds
60. A moderate force will break an egg. However, an egg dropped on the road usually breaks, while
one dropped on the grass usually does not break, because for the egg dropped on the grass
a) the change in momentum is greater.
b) the change in momentum is less.
c) the time interval for stopping is greater. d) the time interval for stopping is less.
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61. Two skaters stand facing each other. One skater’s mass is 60 kg and the other’s mass is 72 kg.
If the skater’s push away from each other
a) the 60 kg skater travels at a higher momentum. b) their momentum is equal but opposite.
c) their total momentum doubles. d) their total momentum decreases.
62. Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's average
acceleration?
A) 0.25 m/s2
B) 40 m/s2
C) 2. m/s2
D) 4.0 m/s2
E) 10 m/s2
63. A car accelerates at 2 m/s2. Assuming the car starts from rest, how much time does it need to
accelerate to a speed of 30 m/s?
A) 15 seconds
B) 2 seconds
C) 60 seconds
D) 30 seconds E) none of the above
64.Suppose you take a trip that covers 240 km and takes 4 hours to make. Your average speed is__.
A) 60 km/h.
B) 480 km/h.
C) 960 km/h.
D) 120 km/h.
E) 240 km/h.
65. A block is at rest on an incline. The force of friction necessary to prevent the block from sliding
increases when the incline angle is __________.
A) increased.
B) decreased.
C) neither A nor B (Force of friction stays the same.)
66. As a ball falls, the action force is the pull of the earth's mass on the ball. What is the reaction to
this force? A) The acceleration of the ball
B) The pull of the ball's mass on the earth
C) Nonexistent in this case
D) Air resistance acting against the ball
E) none of the above
67. A person is attracted towards the center of the earth by a 500-N gravitational force. The force
with which the earth is attracted toward the person is __________.
A) very very small.
B) 500 N.
C) very very large.
68. Bronco the skydiver falls toward the earth. The attraction of the earth on Bronco pulls him down.
The reaction to this force is __________.
A) the earth's surface finally pushing against Bronco.
B) Bronco finally pushing against the earth's surface.
C) Bronco pulling up on the earth.
D) neither A, B, nor C
69. How much does a 1 kg bag of nails weigh? A) 19.6 N B) 2.4 N C) 4.8 N D) 9.8 N E) 7.2 N
70. An object weighs 30 N on earth. A second object weighs 30 N on the moon. Which has the
greater mass?
A) They have the same mass
B) The one on earth
C) Not enough information to say
D) The one on the moon
71. A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball that is initially at
rest. The bowling ball with its putty passenger will then be set in motion with a momentum of ____.
A) 0 kg m/s.
B) 2 kg m/s.
C) 5 kg m/s.
D) more than 5 kg m/s.
E) 1 kg m/s.
72. The momentum change of an object is equal to the __________.
A) impulse acting on it.
B) velocity change of the object.
C) object's mass times the force acting on it.
D) force acting on it.
E) force acting on it times its velocity.
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73. A moving freight car runs into an identical car at rest on the track. The cars couple together.
Compared to the velocity of the first car before the collision, the velocity of the combined cars
after the collision is _______.
A) zero.
B) the same.
C) More information is needed to say.
D) one half as large.
E) twice as large.
74. Which requires more work: lifting a 50-kg sack vertically 2 meters or lifting a 25-kg sack
vertically 4 meters?
A) Lifting the 50-kg sack
B) Lifting the 25-kg sack
C) Both require the same amount of work.
75. If Nellie Newton pushes an object with twice the force for twice the distance, she does ____.
A) twice the work. B) the same work.
C) four times the work.
D) eight times the work.
76. Suppose a jumper claims a hang time of 2 seconds. Then that jumper must be able to jump a
vertical distance of
A) 4 m.
B) 1 m.
C) 2 m.
D)
3 m. E) 5 m.
77. What is the maximum resultant possible when adding a 3-N force to an 8-N force?
A) 5 N
B) 11 N
C) 24 N
D) 8 N
E) 3 N
78. What is the minimum resultant possible when adding a 3-N force to an 8-N force?
A) 3 N
B) 24 N
C) 5 N
D) 11 N
E) 8 N
79. A block is dragged without acceleration in a straight-line path across a level surface by a force of
6 N. What is the frictional force between the block and the surface?
A) Need more information to say.
B) Less than 6 N
C) 6 N
D) More than 6 N
80. A girl whose weight is 200 N hangs from a bar supported by two vertical strands of rope. What is
the tension in each strand?
A) 100 N
B) 200 N
C) 400 N
D) 0 N
E) 300 N
81. A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the
object is __________.
A) 10 N.
B) 4 N.
C) 6 N.
D) 0 N.
E) none of the above
82. You pull horizontally on a 50-kg crate with a force of 500 N, and the friction force on the crate is
250 N. The acceleration of the crate is __________.
A) 4 m/s2
B) zero.
C) 2 m/s2
D) 5 m/s2
83. If you pull horizontally on a crate with a force of 150 N and the crate doesn't move, the friction
force must be 150 N. Now if you pull with 250 N so the crate slides at constant velocity, the
friction force is __________.
A) more than 250 N.
B) more than 150 N but less than 250 N.
C) 250 N.
84. How much power is expended if you lift a 50-N rock 10 meters in 1 second?
A) 5 W
B) 500 W C) 10 W
D) 0 W
E) 50 W
85. How many joules of work are done on an object when a force of 10 N pushes it 5 m?
A) 2 J
B) 5 J
C) 10 J
D) 50 J
E) 1 J
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NOTE: The following highlighted questions (86-88) are Simple Machines and not tested.
86. A girl can easily lift an 80-N rock with the help of a lever. When she pushes down with 10 N of
force, she lifts the rock 0.1 meters. How far does she move her arms to do this?
A) 8 m
B) 0.1 m
C) 0.8 m
D) 10 m
E) 1 m
87. A certain jack has a theoretical mechanical advantage of 500. However, due to frictional forces,
the actual mechanical advantage is only 100. What is the efficiency of the jack?
A) 1/5
B) 50 000 C) 500
D) 5
E) 50
88. A frictionless inclined plane is 6 m long and rests on a wall that is 2 m high. How much force is
needed to push a block of ice weighing 300 N up the plane?
A) 100 N
B) 300 N
C) 50 N
D) 600 N
E) 200 N
89. What is the direction of the force that acts on clothes in the spin cycle of a washing machine?
A) Inward
B) Down
C) Up
D) Outward
90. If you whirl a tin can on the end of a string and the string suddenly breaks, the can will ______.
A) fly directly toward you.
B) fly off, tangent to its circular path.
C) fly directly away from you.
D) spiral in toward your hand.
E) spiral away from your hand.
91. Suppose you try loosening a nut with a wrench, and the nut doesn't give at all. You increase
your chance of success if you __________.
A) be sure to exert force perpendicular to the lever arm
B) exert a larger force
C) extend the lever arm D) have a friend help you pull on the wrench
E) all of the above
92. A meter stick is balanced at the 50-cm mark. You tie a 20-N weight at the 30-cm mark. Where
should a 30-N weight be placed so the meter stick will again be balanced?
A) 20 cm mark
B) 30 cm mark
C) 80 cm mark
D) 70 cm mark
E) 50 cm mark
93. Suppose the gravitational force between two massive spheres is 10 N. If the distance between
the spheres is cut in half, what is the force between the masses?
A) 10 N
B) 5 N
C) 20 N
D) 2.5 N
E) 40 N
94. Suppose the gravitational force between two massive spheres is 10 N. If the magnitude of each
mass doubles, what is the force between the masses?
A) 2.5 N B) 20 N C) 40 N D)10 N E) 5 N
95. In the v vs. t graph to the right, the object’s
velocity is
A) increasing
B) decreasing C) constant
96. In the v vs. t graph to the left, the
acceleration of the object is
A) 0 m/s2 B) 10 m/s2 C) 20 m/s2 D) 30 m/s2
97. In the v vs. t graph to the left, the displacement of the object is
A) 0 m
B) 30 m C) 45 m
D) 90 m
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98. Use the position vs. time graph to the right to describe the motion of the
object.
A) The object is not moving.
B) The object is moving at a constant speed.
C) The object is speeding up at a constant rate.
D) The object is slowing down at a constant rate.
99. Christian kicks a soccer ball with an initial velocity of 10 m/s at an angle of 30 degrees. How
high does the ball go?
A) 1.28 m
B) 10 m
C) 0.64 m
D) 2.56 m
100. How long is Christian’s soccer ball in the air?
A) 0.51 s
B) 1.02 s
C) 2.04 s
D) 1.5 s
101. How far down the soccer field does Christian’s ball go?
A) 4.4 m
B) 1.28 m
C) 8.83 m
D) 5 m
102. Two forces act on an object, a 10 N force to the right, and a 15 N force straight up. What is
the net force on the object?
A) 25 N
B) 18 N at 34o
C) 5 N
D) 18 N at 56o
103. A 5 kg object moves in a circle of radius 2 m at a speed of 1.5 m/s. What is the centripetal
force on the object?
A) 3.75 N
B) 5.6 N
C) 3 N
D) 1.3 N
104. What is the force of gravitational attraction between the Earth, with a mass of 5.98x1024 kg,
and another planet with a mass of 1.5x1018 kg? The distance between them is 1.5x1030 m.
A) 1.5x1020 N
B) 6.67x10-11 N
C) 3.8x10-15N
D) 2.66x10-28 N
105. A 5 kg object initially at rest has a 10 N force exerted on it over a distance of 5 m. What is the
final velocity of the object?
A) 10 m/s
B) 20 m/s
C) 2 m/s
D) 50 m/s
106. An 5 kg object starts from rest at an initial height of 5 m. After it has fallen 2.5 m, how much
kinetic energy does it have?
A) 0J
B) 245 J
C) 122.5 J
D) 200 J
107. A 80 kg football player moving at 5 m/s East collides with a 70 kg football player who is initially
at rest. If they move together after the collision, how fast do they move?
A) 7.2 m/s
B) 0 m/s
C) 5.2 m/s
D) 2.7 m/s
108. If the football players in problem 107 do not stick together, and the 70 kg player moves at 3
m/s East after the collision, what is the final velocity of the 80 kg player after the collision?
A) 2.4 m/s East
B) 2.4 m/s West
C) 2.7 m/s East
D) 1.5 m/s West
109. A 10 kg cannonball is initially at rest inside a 500 kg cannon. After firing, the cannonball is
moving to the East at 100 m/s. How fast and in what direction is the cannon now moving?
A) 2.8 m/s East
B) 2 m/s West
C) 4 m/s East
D) 4 m/s West
110. How much torque is produced when a 10 N force is applied at a lever arm distance of 0.5 m?
A) 20 Nm
B) 2 Nm
C) 10.5 Nm
D) 5 Nm
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