All movements are related to a reference frame. Saying that a body is at rest, or that it is not in motion, simply indicates that it is being described concerning a frame of reference that moves with the body. A body on the surface of the Earth, for instance, may seem to be at ease, but that's only because the witness is also on the surface of the Earth. The Earth, along with the body and the observer, is constantly moving in its orbit around the Sun and spinning on its axis. The movements of bodies generally follow Newton's laws of motion. However, mobility near the speed of light requires the theory of relativity, whereas the motion of very tiny things (such as electrons) requires quantum mechanics.
What is a Motion?
Asked 16-Jun-2018
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Motion is defined in physics as a change in a body's position or orientation over time. A shift along a single direction or an arc is referred to as 'translation.' Rotation is a sort of motion in which the orientation of a body is altered. In both situations, all parts of the body have the same mobility (targeted speed) and pressure (time rate of change of velocity). The most basic form of motion combines rotation and translation.