Quotation from: General Science

Written by: Bertha M. Clark


In our study of the atmosphere we saw that air can be compressed and
rarefied; in other words, we saw that air is very elastic. It can be
shown experimentally that whenever an elastic body in motion comes in
contact with a body at rest, the moving body transfers its motion to
the second body and then comes to rest itself. Let two billiard balls
be suspended in the manner indicated in Figure 167. If one of the
balls is drawn aside and is then allowed to fall against the other,
the second ball is driven outward to practically the height from which
the first ball fell and the first ball comes to rest.

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