Rest and Motion in Physics

Rest and motion

Rest

Usually we consider rest as any relaxing moment or when you have nothing to do but in physics it has different meaning , In physics rest is defined as any body that does not change it's position with respect other then this body is said to be at rest for example when two bodies are moving with uniform velocities then both bodies will be at rest with respect to each other despite the fact that they are moving but with respect to each other they are not changing their positions.

Motion 

When any body changes it's position with respect to other then this body will said to be in motion, for example a car is passing by you at that moment car is changing it's position with respect to you so car will said to be in motion but point that should be noted here is as the car changes it's position your position is also being changed with respect to car so though you are standing motionlessly but in Physics you will also be considered a body that has motion, similarly as we all know that son do not move but since earth is continuously in motion so the son will also be said in motion.