any four cases in which friction needs to be increases to do the work
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Examples of increasing friction-the tyres of a motor car and bicycles are made rough to increase the friction .when a ground or surface become slippery after rain or water splashing it is made rough by spreading sand to increase the friction.
Quite often uses of friction can be seen from how things would be without friction. If there was no friction, you would not be able to walk, drive a car, or hold objects. Pens and pencils would not work. Friction is also necessary to stop a car or bike through the use of brakes.
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