Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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Figure
5-1
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1.
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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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2.
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A slanted
surface used to raise an object is a(n) ____. a. | efficiency board | c. | inclined plane | b. | effort
ramp | d. | screw | | | | |
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3.
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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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4.
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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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5.
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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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6.
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A machine
that changes only the direction of a force has a mechanical advantage of ____.
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7.
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The unit of
power is the ____. a. | joule | c. | m/s | b. | watt | d. | second | | | | |
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8.
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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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