Question

4. Give reasons for the following. 1. Air resistance increases with increase in speed of the moving object. 2. We sprinkle talcum powder on the board when we play carrom. 5. It is slippery and difficult to walk on a floor with new tiles. . Birds and aeroplanes have streamlined bodies. Roller skates have ball bearings in the wheels


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Answer 1

Answer:

As an object begins to move faster, air resistance or drag increases. ... When the air is denser, this slows down the movement of objects because the object has to shove aside heavier molecules. When this type of air resistance occurs, it is referred to as drag.

2. We sprinkle powder on carrom board to make the surface of the board smooth.

3. Because the opposing force is called friction.

4. Birds have streamlined body so as to reduce the air resistance during flying.

5.

Explanation:

Roller skates have ball bearings in the wheels to reduce friction and to convert sliding friction into rolling friction.