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The idea is that energy is transferred from one point to another. A simple experiment with glass marbles is very illustrative. Put some marbles - say, 3 - in a straight row. Preferably in some kind of groove, so that they don't escape to the sides. Make a 4th. marble knock into the row of marbles from behind. The new marble stays right behind the last marble, but the first marble in the row gets away! Quite simply, the impulse was transferred from each marble to the next - the marbles themselves remained in place. Well, the ones in the middle at any rate.

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15y ago

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