Never, because it's always relative.
In physics, a point of view with regard to motion is called a reference frame. It is used to describe the motion of an object relative to a chosen point or object, providing a frame of reference for measuring distances and velocities. Different reference frames may result in different observations of the same motion.
A common frame of reference when describing motion is the observer's point of view or a fixed point in the environment that is used as a reference to describe the motion of an object. This helps to establish direction, speed, and location of the object in relation to the observer or the fixed reference point.
By observing the object
Yes, it all depends on the point of view. An object can be at rest for one observer, and in uniform motion for a different observer.
An observer uses a frame of reference to detect motion because motion is relative and depends on the observer's point of view. By using a frame of reference, the observer can establish a stationary point against which to measure an object's position and velocity. This helps in determining whether an object is in motion or at rest relative to the observer.
the point of view that you describe motion from is whatever you choose it to be. generally we describe motion relative to earth. for example you could say that a car is moving 60mph north, and it would be assumed to be moving relative to earth; but if someone is riding their bike 10mph north, then the car is moving 50mph north relative to the bike. you see, you could describe the car moving compared to a star in a distant galaxy if you wanted, but that would be useless information so you should choose something relative to the problem.
Motion is relative. That's because you can't define motion because it's relative to the observer's point of view. :D Oh & you have to have a reference frame b/c you can't answer, "are you moving?" It has to be "are you moving compared to ______."
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Relative motion is : The comparison of motion between two different objects from the view of another object
The apparent motion of an object depends on both the observer's perspective and the motion of the object itself. As the observer moves, their angle of view and distance from the object change, altering how the object appears to move relative to them. In addition, the speed and direction of the object's actual motion will impact how it appears to move to the observer.
Motion is relative, meaning it must be described with respect to a reference point or frame of reference. This is because direction and speed are defined in relation to the reference point, and an observer's view of motion can change depending on their perspective. Without a reference point, it would be impossible to determine if an object is moving or at rest.