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Motion (physics)

Motion involves change in position, such as in this perspective of rapidly leaving Yongsan Station

In [physics] , motion is change of location or [position] of an object with respect to time. Change in motion is the result of an applied [force] . Motion is typically described in terms of [velocity] , [acceleration] , [displacement] , and [time] . An object's velocity cannot change unless it is acted upon by a [force] , as described by [Newton's first law] also known as [Inertia] . An object's [momentum] is directly related to the object's [mass] and [velocity] , and the total momentum of all objects in a [closed system] (one not affected by external forces) does not change with time, as described by the [law of conservation of momentum] .

A body which does not move is said to be at rest , motionless , immobile , , or to have constant ( [time-invariant] ) position.

Motion is always observed and measured relative to a [frame of reference] . As there is no absolute reference frame, absolute motion cannot be determined; this is emphasised by the term relative motion .
A body which is motionless relative to a given reference frame, moves relative to infinitely many other frames. Thus, everything in the universe is moving.

More generally, the term motion signifies any spatial and/or temporal change in a physical system. For example, one can talk about motion of a wave or a quantum particle (or any other [field] ) where the concept location does not apply.

Laws of Motion

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