Assertion: when the surface are pressured harder, friction increases.
Reason: the friction is caused by the interlocking irregularities in the two surface.
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Answer:
WHEN TWO BODIES RUB WITH EACH OTHER FRICTION INCREASE.
Explanation:
THERE ARE SMALL PITS AND BUMPS ON EVERY SUBSTANCE.WHEN TEO BODIES COLLIDE OR RUB, THE PITS AND BUMP GET LOCKED WHICH CAUSES INCREASE IN FRICTION.
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