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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