Physics - The centripetal force can be friction
The centripetal force can be friction
Consider the following case of a person running in a circle:
Friction provides the centripetal force for this runner
There are three forces acting on the person:
* the person's weight
* the normal reaction from the ground, and
* sideways friction
The net force is the sum of all these - in this case it is easy: the
weight is balanced by the normal reaction, leaving the resultant equal to
the friction force (directed towards the centre of the circle).
Therefore, in this case:
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