Q12 of 14 Page 155

Explain why machines parts are frequently oiled and greased.

Machines parts are frequently oiled and greased


Friction occurring in the machines and their components creates heat and hampers the functioning of it. Oil and grease lubricate the machine parts and help in reducing the friction and also a smooth running of the machine. Thus the machine works efficiently and does do not tear in the long run.


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What is the cause of heat generation in the following situations: a) we apply brakes on our fast-moving car?

b) People often jump up and down to feel warmer in cold weather?

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Explain why:

(a) A pencil will write on paper but not on glass.


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


(c) The soles of our shoes wear out gradually.


(d) Tiers of car wear out gradually.

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Why does the jar of a Mixer Grinder get hot when running for a few minutes?

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List 10 Advantages of Friction.