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Those are good problems, Herb.You don't really need to use a bicycle (or even a tricycle) to
A few years ago at an AAPT meeting held at the University of
British Columbia I perfomed the demonstration of pulling backwards
on the lower pedal of a bicycle. I used a very low gear (24") and
extended the crank. The direction of motion (acceleration) of the
bicycle depends upon where one pulls along the crank. One can pull
backwards and have the bicycle move forward!