Question

D.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.
3. It is slippery and difficult to walk on a floor with new tiles.
4. Birds and aeroplanes have streamlined bodies.
5. Roller skates have ball bearings in the wheels.
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Answer 1

Answer:

hopes it helpful for you

Answer 2

Answer:

1.because density of the air increases

2.they decrease the resistance or friction of the surface

3.because they have least friction