Why did the bike rotate in the physics experiment in the film 187?

Gregory D

New member
In the beginning scene of the film One Eight Seven, Samuel Jackson's character has one of his students hold a bicycle while sitting in a chair, and pump the pedals until the wheel got up to around 180 rpm.

When he told the student to tilt the bike to the right, the chair started rotating.

Why? I can't think of any legitimate physics reason why this would happen.
 
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