Question

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Answer 1

Explanation:

Properties of friction It is opposing force

Answer 2

Answer:

1)Two properties of friction:-

*Force required to overcome friction is proportional to normal force N.

*Frictional forces are independent of surface area if total mass pulled is constant.

2.There are two main types of friction,

*Static friction and

*Kinetic friction.

3.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.

4.Climbing a greased pole is dangerous because as we ascend a pole, there can be a force of friction that assists us in climbing the pole, but the grease on the pole reduces the friction to a very low level. As a result, we are unable to secure a hold on the pole, making climbing impossible.

5.Old and smooth tyres are discarded because without any hooves in their tyres their cars would not run smooth( as grooves in the car tyres provides friction in the opposite direction which helps them move further) .