Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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If
you ride your bicycle down a straight road for 500 m then turn around and ride back, your distance is
____ your displacement. a. | greater than | c. | less than | b. | equal
to | d. | can’t
determine | | | | |
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2.
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Motion is a change in ____. a. | time | c. | velocity | b. | speed | d. | position | | | | |
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3.
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The
speed you read on a speedometer is ____. a. | instantaneous speed | c. | average speed | b. | constant
speed | d. | velocity | | | | |
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4.
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3 m/s
north is an example of a(n) ____. a. | speed | c. | position | b. | velocity | d. | acceleration | | | | |
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5.
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The
relationship among speed, distance, and time is ____. a. | t =
s/d | c. | s =
dt | b. | d = t/s | d. | s = d/t | | | | |
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6.
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A
single point on a distance-time graph tells the ____. a. | instantaneous
speed | c. | constant
speed | b. | average speed | d. | average velocity | | | | |
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7.
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A
merry-go-round horse moves at a constant speed but at a changing ____. a. | velocity | c. | inertia | b. | balanced force | d. | unbalanced force | | | | |
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8.
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Acceleration is rate of change of ____. a. | position | c. | velocity | b. | time | d. | force | | | | |
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9.
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If
you ride your bike up a hill, then ride down the other side, your acceleration is
____. a. | all
positive | c. | first positive,
then negative | b. | all negative | d. | first negative, then positive | | | | |
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10.
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The
equation used to find acceleration is a = ____. a. | vf –
vi/t | c. | vi
– vf /t | b. | v/t | d. | vi +
vf/t | | | | |
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11.
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A
horizontal line on a velocity/time graph shows ____ acceleration. a. | positive | c. | changing | b. | negative | d. | zero | | | | |
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12.
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Inertia varies depending on ____. a. | force | c. | velocity | b. | mass | d. | motion | | | | |
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13.
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Newton's first law of motion is also called the law of ____. a. | mass | c. | force | b. | inertia | d. | constant velocity | | | | |
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14.
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If a weight
lifter is holding barbells above his head, what does he have to do to perform work? a. | stand
still | c. | step
forward | b. | move barbells sideways | d. | lower barbells | | | | |
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Figure
5-1
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15.
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The fixed
pulley shown in Figure 5-1 does which one of the following? a. | doubles the force
required to lift the block | b. | decrease the force required to lift the
block | c. | makes the block easier to lift by changing the direction of the force
needed to lift it | d. | decreases the force required and changes the direction of the force
required | | |
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16.
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A device
that does work with only one movement and changes the size or direction of a force is a(n)
____. a. | compound
machine | c. | screw | b. | effort machine | d. | simple machine | | | | |
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17.
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The rate at
which work is done is called ____. a. | efficiency | c. | force | b. | effort time | d. | power | | | | |
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18.
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The amount
by which a machine multiplies an effort force is called the ____. a. | efficiency
factor | c. | mechanical
advantage | b. | fulcrum | d. | resistance force | | | | |
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19.
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An inclined
plane with one or two sloping sides forms a machine called a ____. a. | pulley | c. | ramp | b. | lever | d. | wedge | | | | |
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20.
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An inclined
plane wrapped around a cylindrical post is a ____. a. | block and
tackle | c. | ramp | b. | lever | d. | screw | | | | |
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21.
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A machine
that changes only the direction of a force has a mechanical advantage of ____.
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22.
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When two or
more simple machines work together, they are called a(n)____. a. | compound
machine | c. | screw | b. | effort machine | d. | simple machine | | | | |
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23.
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The unit of
power is the ____. a. | joule | c. | m/s | b. | watt | d. | second | | | | |
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24.
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An
arrangement of pulleys designed to reduce the effort force is called a ____. a. | block and
tackle | c. | movable
pulley | b. | fixed pulley | d. | simple pulley | | | | |
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25.
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Two simple
machines that are part of a bicycle are a(n)____. a. | gear and a wheel and axle | c. | inclined plane and a wedge | b. | inclined plane and a
lever | d. | screw and an inclined
plane | | | | |
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