Question

2. A surface is rubbed to make it smoother.
What effect will this have on friction?
Give reasons.
3. Two surfaces are rubbed together, first with
a small force and then with a greater force.
In which case will the friction between the
surfaces be higher? Give reasons.​

Answer 1

Explanation:

2. Making the surface smooth would certainly reduce friction. This is so because friction can act best in rough surfaces.

3. Friction will be higher in case of the grater force because at that time more amount of applied work or energy will get converted to heat, thus increasing friction.

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