Question

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Answer 1

Answer:

Here is your answer

Explanation:

(A) friction causes wearing of surfaces

(B) friction can be reduced is we use ball bearings

(C) oiling of cycle reduce friction and helps to run the cycle faster...

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Answer 2

Answer:

a) treded tyres: It is done on vehicle's tyres so that interlocking between the surfaces of tyre and road increases preventing the vehicle to skid when drove at high speed.

b) Ball bearings: rolling friction is least friction producer, so it is used in the machines, between there surfaces to present them from wearing and tearing during their operation.

c) Greasing: Greasing material, like machine oils are, used as lubricants in machine parts like cycle chains to reduce the force of friction where it surface interacts with other surfaces, to move the machine and operate it smoothly.

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