Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1
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The weight of a person can be represented by a vector that acts
a. | straight down, even if the person is standing on a hill. | b. | parallel to the
ground. | c. | in a direction that depends on where the person is standing. | d. | perpendicular to the
ground underneath the person. | e. | all of the
above |
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2
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Compared to its mass on Earth, the mass of a 10-kg object on the moon is
a. | less. | b. | more. | c. | the
same. |
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3
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A 15-N force and a 55-N force act on an object in opposite directions. What is
the net force on the object?
a. | 40 N | b. | 70 N | c. | 15
N | d. | 55 N | e. | none of the
above |
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4
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A 8-N force and a 26-N force act in the same direction on an object. What is the
net force on the object?
a. | 26 N | b. | 18 N | c. | 34
N | d. | 8 N | e. | none of the
above |
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5
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Compared to its weight on Earth, a 10-kg object on the moon will weigh
a. | less. | b. | more. | c. | the same
amount. |
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6
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A gymnast whose weight is 520 N hangs from the middle of a bar supported by two
vertical strands of rope. What is the tension in each strand?
a. | 520 N. | b. | 780 N. | c. | 260
N. | d. | 0 N. | e. | 1040 N. |
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7
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What is the minimum resultant possible when adding a 2-N force to an 8-N
force?
a. | 6 N | b. | 10 N | c. | 8
N | d. | 16 N | e. | 2 N |
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8
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One object has twice as much mass as another object. The first object also has
twice as much
a. | velocity. | b. | inertia. | c. | gravitational
acceleration. | d. | all of the above |
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9
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What is the maximum resultant possible when adding a 2-N force to a 11-N
force?
a. | 11 N | b. | 13 N | c. | 9
N | d. | 22 N | e. | 2 N |
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10
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The law of inertia states that an object
a. | will continue moving in a straight line unless an outside force acts on
it. | b. | that is not moving will never move unless a force acts on it. | c. | at rest will remain
at rest unless acted on by an outside force. | d. | will continue moving at the same velocity
unless an outside force acts on it. | e. | will do all of the
above. |
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11
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How much does a 1.0-kg bag of nails weigh?
a. | 19.6 N | b. | 2.4 N | c. | 7.6
N | d. | 9.8 N | e. | 4.8 N |
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12
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Friction
a. | acts in a direction that opposes the motion of an object. | b. | is the name given to
the force acting between surfaces sliding past one another. | c. | comes from
microscopic bumps that act as obstructions to the object's motion. | d. | all of the
above | e. | none of the above |
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13
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A sheet of paper can be withdrawn from under a container of milk without
toppling it if the paper is jerked quickly. The reason this can be done is that
a. | the milk carton has very little weight. | b. | the milk carton has
inertia. | c. | gravity pulls very hard on the milk carton. | d. | none of the
above |
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14
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An object weighs 10 N on Earth. A second object weighs 10 N on the moon. Which
has the greater mass?
a. | The one on Earth | b. | They have the same mass. | c. | The one on the
moon | d. | Not enough information to say |
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15
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Equilibrium occurs when
a. | all the forces acting on an object are balanced. | b. | the sum of the
+x forces on an object equals the sum of the –x forces. | c. | the sum of the
upward forces equals the sum of the downward forces. | d. | the net force on the object is
zero. | e. | all of the above |
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16
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The law of inertia applies to
a. | objects at rest. | b. | moving objects. | c. | both moving and
nonmoving objects. |
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17
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Which has more mass, a kilogram of feathers or a kilogram of iron?
a. | Neither—they both have the same mass. | b. | The
feathers | c. | The iron |
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18
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Friction is a force that always acts
a. | in the same direction as an object's motion. | b. | opposite to an
object's motion. | c. | perpendicular to an object's
motion. |
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19
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The astronomer Copernicus publicly stated in the 1500s that Earth
a. | is the center of the solar system. | b. | is slowing down. | c. | revolves around the
sun. | d. | does not move. | e. | moves in a straight
line. |
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20
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After a cannonball is fired into frictionless space, the amount of force needed
to keep it going equals
a. | zero, since no force is necessary to keep it moving. | b. | one quarter the
force with which it was fired. | c. | the same amount of force with which it was
fired. | d. | one half the force with which it was fired. | e. | twice the force with
which it was fired. |
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