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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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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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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4.
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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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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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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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7.
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A lever with
a mechanical advantage greater than 1 is used to ____. a. | change
direction | c. | increase
force | b. | increase distance | d. | increase force and change direction | | | | |
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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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