Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which of the following universal forces is the weakest?
a. | electric | c. | magnetic | b. | gravitational | d. | strong nuclear |
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2.
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As an astronaut travels far away from Earth, her weight
a. | decreases because gravity decreases. | b. | decreases because her mass
decreases. | c. | increases because gravity increases. | d. | remains the same because her mass remains the
same. |
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3.
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The gravitational force between two objects increases as mass
a. | decreases or distance decreases. | c. | increases or distance
decreases. | b. | decreases or distance increases. | d. | increases or distance
increases. |
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4.
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The force that keeps an object moving in a circle is called
a. | centripetal force. | c. | inertia. | b. | fluid friction. | d. | momentum. |
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5.
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The centripetal force acting on a satellite in orbit
a. | acts as an unbalanced force on the satellite. | b. | changes the
direction of the satellite. | c. | is a center-directed force. | d. | all of the
above |
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Completion
Complete each
statement.
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6.
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A push or pull is an example of a(an) ____________________.
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7.
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The type of force measured by a grocery store spring scale is
____________________.
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8.
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The sum of all the forces acting on an object is called the
____________________.
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9.
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If the forces acting on an object produce a net force of zero, the forces are
called ____________________.
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10.
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The force that opposes the motion of objects that touch as they move past each
other is called ____________________.
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11.
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It usually takes more force to start an object sliding than it does to keep an
object sliding because static friction is usually ____________________ than sliding friction.
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12.
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The two forces acting on a falling object are gravity and
____________________.
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13.
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When a falling object reaches terminal velocity, the net force acting on it is
____________________.
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14.
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The drag force acting on a falling sky diver is also known as
____________________.
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15.
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The path of motion of a thrown javelin is an example of ____________________
motion.
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16.
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The tendency of an object to resist any change in its motion is called
____________________.
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17.
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During a head-on auto collision, ____________________ causes a passenger in the
front seat to continue moving ____________________.
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18.
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The acceleration of an object is equal to the net ____________________ acting on
the object divided by the object’s ____________________.
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19.
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The force of gravity acting on an object is the object’s
____________________.
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20.
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If a golf ball and bowling ball are rolling at the same speed, the
____________________ ball has greater momentum.
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21.
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When you push on a wall, the ____________________ pushes back on you.
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22.
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In a closed system, the loss of momentum of one object ____________________ the
gain in momentum of another object.
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23.
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The observation that a charged object can attract or repel other charged objects
led scientists to conclude that there are ____________________ types of charges.
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24.
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The universal force that is effective over the longest distances is
____________________.
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25.
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The centripetal force acting on the moon continuously changes the
____________________ of the moon’s motion.
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