Bore with a small drill into a hard board. The drill becomes hot to touch Why? What happens if hard board is replaced by a soft board? Why spark is produced when two stones collide against each other?
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When a bore is made in a hard board, the friction between the drill and the board is quite large. A large amount of work has to be done in making the bore which produces a large amount of heat and the drill becomes too hot to touch. Hence heat produced is also small.
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seed drill is better as compared to depth resulting in poor output you are unsmart
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