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Explain the origin of (i) sliding fricti...

Explain the origin of (i) sliding friction (ii) the rolling friction .

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  10. Explain the origin of (i) sliding friction (ii) the rolling friction .

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  11. Explain that static friction is a self adjusting force .

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  12. Explain the terms (i) angle of friction (ii) coefficient of friction a...

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  17. How does the lubrication of a machine help in reducing friction ?

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  19. Establish that friction is a necessary evil

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