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According to Newton’s laws of motion, an object set in motion remains in motion unless a force acts on it. If you suspend an object from a string and make it swing, the object will swing for a while, then slow down and stop. Why does the suspended object stop swinging?

A Because energy of motion is converted to heat through friction with air.

The object set in motion slows down and stops swinging because the force of friction acts on it. The kinetic energy of the object is converted to heat energy through friction with air. An object having any mass can maintain motion.

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