give two examples where friction is a evil
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Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. ... But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil .
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vehicles with worn out tyres stop after covering a much longer distance ( when brakes are applied ) and hence, there is a greater risk of accident. Friction produces heat. A matchstick lights up due to the friction against the side of matchbox when we strike it, This can destroy houses when catches fire.
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