Q 3) Give one situation where it is desirable to increase friction. Explain four methods by which friction between two solid surfaces in contact can be reduced.
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Answer: The four methods by which friction between two solid surfaces in contact can be reduced are: By polishing – Polishing a rough surface smoothens it and reduces the friction. By lubrication – Lubricating the surface with oil, grease or graphite decreases the friction between two surfaces. :)
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