How are rest and motion relative terms?

Answer 1

When an object is at rest, it is only at rest compaired to the observer. Consider that if you are in a moving vehicle then your passenger is at rest from your point of view, but to an observer, outside the vehicle the passenger and you are both in motion. Similarly to you inside the vehicle the observer outside is moving . as the earth itself is in motion, as well as the sun and in fact the whole galaxy, their is no way to absolutely define an at rest state, so all motion is measured relative to the observer, who is assumed to be at rest compaired to the observation.

Answer 2

A body seems to be at rest with respect to one neighboring fixed object but the same body may appear to be in motion with respect to some other fixed neighboring object So, rest and motion are relative terms

Answer 3

Any definition of motion has to be relative to a frame of reference. My book is at rest on the table but the Earth is spinning & orbiting the sun. If we take the room or the Earth as a frame of reference my glass is at rest. If we take the sun as our frame of reference my book is moving very fast.

Answer 4

Rest and motion can only be determined in relation to the system in which they are occurring. For example, you can say a car is moving at thirty miles per hour down a street. The street is the system, and relative to it, the car is moving. However, the car, even if it was at rest, is moving in other ways: the rotation of the earth, the revolution of the earth around the sun, the movement of the galaxy, and many more. A car could be moving at 30 mph in relation to a street, or 67,000 mph in relation to the sun. It depends on which aspects of motion you consider.