Question

A coin and a piece of paper are dropped simultaneously from the same height.Which of the two will touch the ground first? What will happen if the coin and the piece of paper are dropped in vacuum? Give reason to your answer.

Answer 1

Hint: The frictional resistance of air is the single factor that causes one object to fall faster than the other. Both will take the same length of time to reach the ground if the test is conducted in a vacuum chamber.

Complete answer:
Air resistance is one type of friction or resistance. Air resistance occurs when a falling object's surface interacts with the air around it, slowing the pace at which the thing descends. Because air resistance is proportional to surface area, the greater the surface area, the greater the air resistance.

The coin, as opposed to the sheet of paper, hits the ground first because it encounters less air resistance than the latter. The coin will land first because it has more mass than the piece of paper. As a result, the earth will exert a greater gravitational strain on it.If the coin and the piece of paper are dropped in vacuum both will touch the ground at the same time as there is no gravitational force present. There would be no other external force acting on them.

Note: Work can never be positive if you view the application of friction from a frame fixed to any of the surfaces on which friction is acting. Friction is constantly opposed to relative motion between two surfaces by its very nature. When there is no relative motion, the work done by friction can be zero.