Rest and Motion are Relative

Physics

definition

Motion of a body

A body is said to be in a state of rest w.r.t. a stationary body if its position does not change with time as seen by the stationary body. Similarly, it is in the state of motion w.r.t a stationary body if its position changes with time as seen by the stationary body.   

definition

Relative motion of a body

A body is in a state of motion w.r.t. a moving body if its position changes with time as seen by the moving body, else it is at a state of rest w.r.t the moving body. This occurs if and only if the velocity of the two bodies are equal at all instances of time. For example, two people standing on the surface of the earth see each other to be at rest. Actually, they are both moving as the earth is rotating.

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