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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
- Explain why : a pencil will write on paper but not on glass.
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- Explain why : climbing a greasy pole is very difficult.
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- Why does a matchstick light when we strike it on a rough surface ?
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- Why is it difficult to light a matchstick by striking it on a smooth s...
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- Can two different bulbs, similar in all respect act as coherent source...
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- Why do brake pads of bicycles have to be replaced quite often ?
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- A pencil earser loses tiny pieces of rubber each time you use it. Why ...
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- What happen when you rub your hands vigorously for a few seconds ? Why...
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- Explain how, friction enables us to walk without slipping.
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- How does a bicycle stop when its brakes are applied ?
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- Explain why, the soles of our shoes wear out gradually .
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- Why do tyres of cars wear out gradually ?
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- State two advantages and two disadvantages of friction.
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- Explain why, sportsmen use shoes with spikes.
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- How will you reduce friction between those machine parts which rub ag...
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- What is meant by lubriication ? Why is it important ?
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- Explain why , wheels are so useful.
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- Why are lubricants (oil or greses) applied to rubbing surface of machi...
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- Explain, how the use of oil reduces friction between two surface in co...
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- Why are cars, aeroplanes and rockets streamlined ?
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