What enables us to fix a nail in a wall and knots to be tied?
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Friction enables us to fix a nail in a wall and knots to be tied.
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It is the frictional force that allows us to fix a nail in a wall and knot to be tied. It is the friction between the surface of the nail and the wall that keeps the nail intact with the wall. Even knots in the ropes are held together due to the force of friction.
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