Magnetic swinging balls

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When the fifth ball begins accelerating, it is receiving momentum and energy from the third and fourth balls through the spring action of their compressed surfaces. For identical elastic balls of any type with initially touching balls the action is the same for the first strike, except the time to complete a collision increases in softer materials. This separates the balls, but they come back together just before as the fifth ball returns. This is due to the pendulum phenomenon of different small angle disturbances having approximately the same time to return to the center. When balls are "touching" in subsequent collisions is complex, but still determinable by this method, especially if friction losses is included and the pendulum timing is calculated exactly instead of relying on the small angle approximation.
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