Question

give reason for the following

1.A ball rolling on the ground stops after some time

2.Aeroplanes and cars are given streamlined shape.

3.It is difficult to write on a glazed paper

4. Shoes of athletes have grooves on their soles.

5.When you rub your palms, they became hot.​

Answer 1

Answer:

1. When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion. A rolling ball stops because of friction.
2. The aeroplanes and ships have streamlined shaped bodies to reduce drag. The streamlined shaped body experiences minimum resistance when travelling through water or air. It helps to reduce friction.
3. the glaze paper has a smooth nature and therefore less friction and that is why it is difficult to write on it .
4. Soles of shoes are grooved because the grooves increases the friction and gives the good grip to the person while walking with shoes. The shoes of athletes have grooves under them because in order to prevent the athletes from slipping and getting hurt
5. due to friction between the hand and the other hand

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