Motion is calculated by comparing it to something else which may or may not be stationary. Hence you are measuring it's motion relative or in relation to the other object.
Relative motion
Friction opposes the relative motion of surfaces in contact. It acts in the direction opposite to the direction of motion or tendency of motion between two surfaces.
Motion is relative to an observer's frame of Reference.
At rest and in motion are relative terms. When we say 'in motion' or 'at rest' we mean relative to something else. If you were travelling in a car for instance, you would be at rest relative to the car but in motion relative to the outside world.
motion is realtive
The statement "rest and motion are relative terms" means that whether an object is considered at rest or in motion depends on the observer's frame of reference. For example, a person sitting on a bus is at rest relative to the bus, but in motion relative to a person standing on the street. This illustrates that rest and motion are relative concepts.
Friction is a force that resists the relative motion or tendency of motion between two surfaces in contact. It makes it harder for objects to slide past each other or move.
The object is in motion relative to the reference point.
All motion is relative to yourself, as there is no fixed point anywhere in our universe, as it is all traveling away from the center of the big bang. But if we ever find where the bigbang happened, that would be where all motion is relative to
When its position is changing relative to our position. Note: all motion is relative to something else.
He is in motion relative to me, and he is at rest relative to his friends. There is no 'real' rest or 'real' motion. It's always measured relative to something else.
Relative motion is the concept that the motion of all objects is relative to other objects. If you are sitting still right now you are not moving relative to the earth, however you are moving relative to sun.