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Re: [Phys-L] Perpetual Motion Machine

On 03/25/2015 07:08 AM, Bill Norwood wrote:

It might be a worthwhile demo to measure the on-screen slowing down of
these perpetual motion machines, which, by the way, are operated only for
short intervals in the video.

The videos look fake to me. I assume there is a hidden motor
to overcome friction.

Along the same lines: If they were serious about presenting
the actual physics, they would demonstrate running each machine
in the "backwards" direction.