Question

What is meant by everything that is in motion must be moved by something

Answer 1

Since everything that is in motion must be moved by something, let us take the case in which a thing is in locomotion and is moved by something that is itself in motion, and that again is moved by something else that is in motion, and that bysomething else, and so on continually: then the series cannot go on to ...

Answer 2

In physics, motion is a change in position of an object over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, time, and speed. ... One can also speak of motion of shapes and boundaries.

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