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Frictional Force

How air cushi...

Question

How air cushion is used to reduce friction

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Solution

Dear Student

An air cushion (layer of air) under a hovercraft enables a hovercraft to glide easily above water/land as it removes the contact between the surfaces and thus friction is reduced.

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How does air cushions reduce friction?

Which of the following is NOT used to reduce friction?

Q. Choose the correct statement from the following:

1. Grease is used to reduce friction in the bicycle chain.
2. Ball bearings are used to reduce friction in a fan.
3. Oil is used to increase friction in car parts.
4. Talcum powder is used to reduce friction on a carrom board.

Q. Choose the correct statements from the following:
A) Grease is used to reduce friction in the bicycle chain.
B) Ball bearings are used to reduce friction in a fan.
C) Oil can be used to increase friction in a car engine.
D) Talc can be used to reduce friction in a carrom board.

Q. How does the use of ball bearings reduce friction?

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