Quotation from: General Science

Written by: Bertha M. Clark


The advantage of an inclined plane can be seen by the following
experiment. Select a smooth board 4 feet long and prop it so that the
end _A_ (Fig. 104) is 1 foot above the level of the table; the length
of the incline is then 4 times as great as its height. Fasten a metal
roller to a spring balance and observe its weight. Then pull the
roller uniformly upward along the plank and notice what the pull is on
the balance, being careful always to hold the balance parallel to the
incline.

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