Q. 113.5( 2 Votes )

Explain why:
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Answer :

(a) The paper surface is rough enough to provide a frictional force against the force that we apply on a pencil to write with. The friction between the pencil tip and paper causes the carbon from the pencil to be left on the paper.


On the other hand, the glass surface is extremely smooth. It cannot create a frictional force against the applied force the pencil so that it leaves some carbon on it.


Thus writing with pencil is possible on the paper but not on glass.


(b) The handles of motor cycle are covered with a rubber sheet with spikes


The handles of motor cycle are covered with a rubber sheet with spikes to increase the friction between our palms and fingers and the handles of the motor cycle. The ridges of our skin and a spikes of the rubber sheet increases friction which enhances our grip.


(c) The handles of motor cycle are covered with a rubber sheet with spikes


The soles of our shoes wear out gradually


While walking there is a constant friction which works with our feet and the ground. This constant friction causes our shoes to wear out gradually with continuous use.


(d) Tiers of car wear out gradually.


Tiers of car wear out gradually because of the continuous friction that operates between the tires and the road so that the tier can move forward.


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