Question

why sliding friction less than static friction​

Answer 1

Answer:

During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction. But, when the object is at rest, the surfaces interlock well, therefore friction is more. This explains why sliding friction is less than static friction.

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Answer 2

Answer:

THREE THINGS REQUIRED FOR COMBUSTION ARE

FUEL, AIR, FIRE