# Friction (Practice Sheet, Class 8)

(1) A player hit a ball in the play ground. The ball stops its own. Explain.

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(2) What is rolling friction?

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(3) How teachers write on the black board with chalk?

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(4)What are lubricants? Give examples.

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(5) Which type of foot wear will be good for the old people to save them from slipping?

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(6) Why wheel is said to be one of the greatest inventions of mankind?

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(7)Fill in the blanks.

(i) The frictional force exerted by fluid is also called ____.

(ii) Ball bearing in wheels _____ friction.

(iii) Friction produces ____.

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(8) Explain, why jar of a mixer becomes hot when it is run for a few minutes.

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(9) Can we reduce friction to zero by polishing surfaces or using large amount of lubricants?

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(10) Imagine that friction suddenly vanishes. How life would be affected. List five such situations.

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Helping Topics

Force and law of motions

Friction

NCERT solutions, class 8