what is drag explain why object move in the fluid must have special shape differentiate between rolling and static friction
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When a body moves through a fluid, it experiences an opposing force which tries to oppose its motion through the fluid. This opposing force is known as the drag force.
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When cars and aeroplanes move at very high speeds,their motion is opposed by friction offered by the air molecules surrounding them.The friction of air produces what is called drag,which opposes the motion of the vehicle.
When a body moves through a fluid, it experiences an opposing force which tries to oppose its motion through the fluid. This opposing force is known as the drag force.This frictional force depends on the shape of the body. By giving objects a special shape,
the force of friction acting on it can be minimized. Hence, it becomes easier for the body to move through the fluid.
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→The frictional force offered when rolling an object is called ROLLING FRICTION. For example, a ball rolling on a surface
→The frictional force produced between two surfaces in contact with each other at the position of rest is called STATIC FRICTION .