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The Movable Pulley

The hinges of...

Question

The hinges of the door produce a squeaking sound. Explain?

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Solution

The hinges of the door produce a squeaking sound.
These phenomena are observed due to the force of friction.
Friction is a kind of resisting force which opposes the motion.
Door hinges are prone to squeaking if the pin in the hinge bends out of shape or if the screws in the hinge are not sufficiently tight.

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