Question

Give reasons . 1. A bicycle can be slowed down by dragging your feet. 2. By spreading sand on an oil spill on road, you can prevent vehicles from skidding . 3. A bowler rubs the cricket ball on his/her clothes during a cricket match.

Answer 1

A bicycle can be slowed down by dragging the feet on the ground owing to frictional force.

Friction can be defined as the force acting between two surfaces in contact, which oppose the motion of one body over another.

When feet are dragged, the force acts in the opposite direction thus reducing the speed of the bicycle.