EASY
Earn 100

  (Talcum powder/Sand) is sprinkled on the carrom board to reduce friction.

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Important Questions on Friction

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Why are treads made in the surface of tyres?
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Why do brake pads of bicycles have to be replaced quite often?
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Which of the following statements is incorrect?
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Which force gets reduced when the two surfaces in contact are polished to make them smooth?
MEDIUM
Explain with the help of diagrams, how the use of oil reduces friction between two surfaces in contact with each other.
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Explain why, wheels are so useful.
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Why are grooves provided in the soles of shoes?
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Why are lubricants (oil or grease) applied to rubbing surfaces of machines?
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Which of the following should be used to reduce friction on a carrom board?
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Why is the surface of a slide polished to make it smooth?
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What is meant by ‘rolling friction’?
MEDIUM
Explain why, sportsmen use shoes with spikes.
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Why do we sprinkle fine powder on carrom board?
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Ball-bearing is a device that usually converts:
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What is meant by lubrication? Why is it important?
EASY

(a) Name two magnetic poles which attract each other.

(b) Name two magnetic poles which repel each other.

MEDIUM
Why are machine parts oiled?
MEDIUM
How will you reduce friction between those machine parts which rub against each other? Give the simplest method.
EASY
Car wheels often spin on icy roads. Explain why.