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B.4.25 Newton's balls (ohp)

Concept: Steel balls are suspended along a line as bifilar pendula. When a ball or balls are drawn back and released on one end, the same number of balls will swing out on the other end.
Keywords: elastic collision, conservation of kinetic energy, conservation of momentum

Time to setup: 2 min
Time to demo: 5 min

Equipment list, location(s)
Newton's balls apparatus on overhead projector.

Notes and suggestions to instructor
Why can't a single ball swing out to twice of the height when two balls are pulled back initially? How does the momentum or energy propagates through the chain of standing balls?

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