Demonstrations of PCOE

It seems that any physics lecturer worth his/her salt must perform this demonstration

Walter Lewin did it.

Paul Hewitt did it

How can we not join in?

OMG, the biscuit tin is rolling upslope. Are you witnessing a PCOE violation?

explanation at xmdemo

OMG what black magic is this? Where are those balls drawing their energy from?

explanation at xmdemo

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