An air cushion between the moving parts is used to reduce friction
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Answer:
The substances which reduce friction are called lubricants. In some machines it may not be advisable to use oil as lubricant. There is an air cushion between the moving parts, that is used to reduce friction. The force that opposes the motion of a moving body is called friction.
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Explanation:
To reduce the friction in machines, air cushion can be used in places of lubricants. Hovercraft uses air cushion instead of lubricants to reduce friction in moving parts.
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