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Friction and Horizontal Circular Motion Problems

In death well...

Question

In death well (a motorcyclist drives the motorcycle on a vertical wooden well, you may have seen this act in circus), which force provides the necessary centripetal force?

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Solution

Death well:
Centripetal force is provided by the normal reaction on tyres by the wall.
Weight force is balanced by friction available between well and the tyres.
Hence, in a death well, the weight force provides the necessary centripetal force.

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