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We all exert a lot of force every day accomplishing basic
tasks. To make work easier, humans have invented
machines. A (4).
makes work easier with a single
motion. It changes the direction of a force and/or the
amount of work that is applied. One example of this type
of machine is a (5).
which is a beam or bar that
There are three
a (6)
pivots on a point called
different classes of this type of machine, but all
three have an (7)
force that is used to
lift the (8)
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