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Cards In This Set
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True or false? Work is measured in joules
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True
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Work is measured in ....
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Joules
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True or false? Power is the rate at which a force is applied.
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True
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......is the rate at which force is applied.
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Power
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True or false? Machines decrease the amount of work required to perform a task.
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False - A machine can make work easier in three ways. It can change the size of a force. It can change the distance over which the force acts. It can change the
direction of a force.
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How do machines make work easier?
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A machine can make work easier in three ways.
It can change the size of a force. It can change the distance over which the force acts. It can change the
direction of a force.
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True or false? if false make it true. The output work done by a machine is more than the work input.
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False, The output work done by a machine never exceeds the work input to the machine.
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Which of the following, by scientific definitions is NOT work?
(A) lifting boxes of books (B) pedaling on your bike
(C) holding a book over your head (D) pushing a chair across the room
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C, Holding a book above your head is not doing work because work involves the
object moving.
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The output work done by a machine........ exceeds the work input to the machine
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Never
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Power is work divided by
(A) time (B) force (C) distance (D) speed
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A
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Which is the force that results from the use of a machine?
(A) input force (B) output force
(C) gravitational force (D) field force
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B
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The force exerted by your foot on the pedal to ride your bike is an example of
(A) input force (B) output force
(C) input work (D) output work
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A
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Machines that are built by putting together two or more simple machines are called
(A) mechanical advantage (B) wheel and axles
(C) can openers (D) compound machines
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D
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Force that results from the use of a machine
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Output force
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Machines that are built by putting together two or more simple machines
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Compound machines
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