. Answer the following in detail.
(1) Explain contact and non-contact force.
(2) Explain why sliding friction is less than static frictio
(3) What do you know about Biosphere Reserve area?
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The friction between the two surfaces is because of the interlocking of the irregularities of the two surfaces.
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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