Multiple Choice Identify the
choice that best completes the statement or answers the question.
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1.
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What is a device that makes work easier by changing the size or direction of
force?
a. | power | c. | machine | b. | watt | d. | force |
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2.
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What is the work done by a machine on an object?
a. | power | c. | work output | b. | work input | d. | lever |
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3.
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What is the work that you do on a machine?
a. | power | c. | work output | b. | work input | d. | lever |
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4.
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What is the number of times the machine multiplies force?
a. | power | c. | mechanical efficiency | b. | output
force | d. | mechanical
advantage |
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5.
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Which of the following in the comparison of a machine’s work output with
the work input?
a. | mechanical efficiency | c. | mechanical advantage | b. | force | d. | power |
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6.
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Which equation would you use to find mechanical advantage?
a. | MA = work output/work input ´
100 | b. | MA = output force/input force | c. | MA = work
input/work output ´ 100 | d. | MA = input
force/output force |
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7.
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Which of the following causes machines not to be 100% efficient?
a. | friction | c. | output force | b. | input force | d. | power |
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8.
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In which situation is a person doing work on an object?
a. | A school crossing guard raises a stop sign that weighs 10 N. | b. | A student walks
while wearing a backpack that weighs 15 N. | c. | A man exerts 350 N force on a rope attached to
a house. | d. | A worker holds a box 1 m off the floor. |
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9.
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Which of the following are simple machines used by the Egyptians to build
pyramids?
a. | screws and screwdrivers | c. | plows and axes | b. | inclined planes and
levers | d. | wheels and
axles |
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10.
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How does a ramp make lifting a heavy object easier?
a. | The object is moved over a shorter distance. | b. | The ramp increases
the amount of work you do. | c. | Less force is needed to move the object over a
longer distance. | d. | More force is needed to move the object over a longer
distance. |
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11.
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Which of the following is NOT a wedge?
a. | knife | c. | chisel | b. | plow | d. | ramp |
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12.
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Where is the input force of a wheel and axle exerted?
a. | a circular distance | c. | an inclined plane | b. | a rectangular distance | d. | a spiral |
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13.
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Greg applies a force of 100 N to move a box 5 meters. How much work did he
do?
a. | 100 J | c. | 5 J | b. | 500 J | d. | 500 N |
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14.
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If you exert 20 N of force on a screwdriver and it exerts 40 N on a paint can
lid, what is the screwdriver’s mechanical advantage?
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15.
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What two things must happen for work to be done?
a. | The object must move and there must be an output force. | b. | The object must move
in the opposite direction of the force. | c. | The object must move in the same direction as
the force. | d. | The object must move and the mechanical advantage must be greater than
1. |
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16.
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A construction worker is lifting a load of bricks onto a truck. He does 200 J of
work in 40 seconds. What is his power output?
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17.
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What type of simple machine is a screw?
a. | inclined plane | c. | lever | b. | wheel and axle | d. | pulley |
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18.
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What is it called when a force causes an object to move in the direction of the
force?
a. | energy | c. | work | b. | force | d. | power |
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19.
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What is the rate at which power is transferred?
a. | power | c. | work | b. | energy | d. | joule |
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20.
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What is a machine that is made of two simple machines?
a. | simple machine | c. | pulley | b. | lever | d. | compound
machine |
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