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 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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2.
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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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3.
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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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4.
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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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5.
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A machine
that changes only the direction of a force has a mechanical advantage of ____.
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6.
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A winding
mountain road is an example of a(n) ____. a. | block and tackle | c. | inclined plane | b. | lever | d. | wheel and
axle | | | | |
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7.
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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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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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