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2. Friction
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Q11 of 16 Page 30

Explain why sliding friction is less than static friction?

Static friction is less than sliding friction as in sliding friction, the object does not move. So the interlocking between the two rough surfaces is more. When a body starts moving the time for interlocking gets reduced. As a result sliding friction is less than static friction.


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Explain how does lubrication reduce friction?

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What kinds of friction do you know?

12

Give examples of how is friction responsible for energy wastages? Give suggestions to reduce energy wastages by friction.

13

Seetha is observing a moving bus with the luggage on its top. As the bus is moving slowly there is a change in the state of luggage on its top. But when the bus speeds up and starts moving fast, she noticed that the luggage on the top of the bus fell to the back of the bus. This raised many doubts in her mind regarding the effect of a frictional force acting on the luggage as well as on the tyres of the bus. Can you guess the questions raised in her mind? Write them.

Questions · 16
2. Friction
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