Question

Q 1. Give 2 points each for Advantages and Disadvantages of Friction.
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Answer 1

Advantages of friction :

Friction enables us to walk freely.

It helps to support ladder against wall.

It becomes possible to transfer one form of energy to another.

Objects can be piled up without slipping.

Breaks of vehicles work due to friction.

Disadvantages of friction:

It always resists the motion, so extra energy is required to overcome it.

It causes wear and tear of machines.

It decreases the life expectancy of moving parts of vehicles.

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Answer 2

Answer:

•Friction helps us to walk on the ground.

•We can write on a paper or on a board due to friction.

•Friction helps in stopping a vehicle on applying the brakes.

•It helps in generating heat when we rub our hands together.

•Asteroids burn in the atmosphere before reaching the earth due to friction and saves lives on earth.

Explanation:

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