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Why a cyclist applies brakes to stop his/her bicycle?
A cyclist applies brakes to stop his/her bicycle. As soon as brakes are applied, the wheels stop rolling and begin to slide over the road. Since sliding friction is much greater than rolling friction. Therefore, the cycle stops very quickly.
1. Why is it easy to roll a cylindrical eraser on a paper sheet than to slide it?
Ans: The fact that rolling friction is less than sliding friction. A cylindrical eraser is a rolling body and can easily roll on a paper sheet than slide it. Because rolling friction is the force of friction between a rolling body and a surface over which it rolls.
2. Do we roll or slide the eraser to remove the pencil work from our notebook?
Ans: The fact that sliding friction is greater than rolling friction. We slide the eraser to remove the pencil work from our notebook.