Machines: Question Preview (ID: 1516)


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There are ___ types of simple machines.
a) three b) six c) eight d) ten
Which of these cannot be done by a machine?
a) multiply force b) multiply energy c) change direction of a force d) work
In an ideal machine, the work input ___ work output
a) is equal to b) is greater than c) is less than d) is independent of
The ___ of a machine is the number of times it multiplies the effort force.
a) efficiency b) power c) mechanical advantage d) resistance
To raise a resistance 4 m, the effort rope of a single fixed pulley must move ___.
a) 2 m b) 8 m c) 1 m d) 4 m
The ideal mechanical advantage of a pulley system in which five ropes support an object is ___
a) 2.5 b) 5 c) 10 d) 25
In a wheel and axle, the resistance force is usually exerted by the ___.
a) axle b) larger wheel c) gear ratio d) pedals
The IMA of an inclined plane 8 m long and 2 m high is ___.
a) 2 b) 4 c) 16 d) 8
As the efficiency of a machine increases, the ___ of the machine increases.
a) work input b) work output c) friction d) IMA
The IMA of an inclined plane can increased by ___.
a) increasing the length b) increasing the height c) decreasing the length d) making its surface smoother
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