What is the Action?
Action is the first ball striking the string of balls. Once the first ball is released, gravity pulls
it toward the other balls. The energy of the ball's motion is transfered through the string of balls
to the last ball.
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What is the Reaction?
Reaction is the energy transfer to the last ball, which swings up. This, in turn, sets up another action-
reaction series until the initial energy is dissipated by friction.
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