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Friction arises because of tiny irregularities (bumps) on the two surfaces in contact.
Why is fine powder sprinkled on a carrom board before playing?
Why do athletes wear shoes with spikes, and why do tyres of vehicles have grooves (treads)?
In an activity, a wooden block is pulled with a spring balance across three surfaces. The reading just as the block starts to move is: glass sheet 2 N, wooden table 3.5 N, sandpaper 6 N. (a) On which surface is friction greatest? (b) Arrange the surfaces in increasing order of friction. (c) What do you conclude about friction?
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