Question

When is an object said to be in motion? Give two examples.

Answer 1

Motion:

1. If the position of a body changes for any observer with time then the body is said to be in motion.
2. Both rest and motion are frame-dependent which means anybody can be in rest or motion for different observers.
3. Examples of bodies in motion: Moving cars, running boys, and flying airplanes are in motion for Earth's frame.