Q13 of 14 Page 155

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

The jar of a Mixer Grinder gets hot when running for a few minutes


While the mixer grinder is on, a frictional force operates between the blades of the mixer grinder and its walls. Continuous friction helps in work done, and thus energy is created which emerges as heat and sound.


So when a mixer grinder is on for a few minutes heat is generated.


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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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Explain why machines parts are frequently oiled and greased.

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List 10 Advantages of Friction.