HOW FRICTION IS INCREASED OR DECREASED? As you have seen in the previous section, friction is desirable in some situations. Have you ever thought why the sole of your shoe is grooved [Fig. 12.11
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WHEELS REDUCE FRICTION You must have seen attaches and other pieces of luggage fitted with rollers. Even a child can pull such pieces of luggage (Fig. 12.14). Why is it so? Let us find out. &nbs
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