Question

give three harmful effect of friction​

Answer 1

Here is your answer :

Three harmful effects of Friction -

1. It produces heat in various parts of machines. In this way     some useful energy is wasted as heat energy.
2. Due to friction, engines of automobiles consume more fuel which is a money loss. 
3. Forest fires are caused due to friction between branches of trees.

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Answer 2

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a. Friction opposes motion.

b. Friction results in wear and tear of the surface incontact

c. Friction produces heat.

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