PHYS 1111L Lecture Notes - Lecture 2: Absolute Time And Space

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27 Nov 2017
In physics, motion is a change in position of an object over time. Motion is described in
terms of displacement, distance, velocity, acceleration, time and speed. Motion of a body is
observed by attaching a frame of reference to an observer and measuring the change in
position of the body relative to that frame.
If the position of a body is not changing with respect to a given frame of reference, the body
is said to be at rest, motionless, immobile, stationary, or to have constant (time-invariant)
position. An object's motion cannot change unless it is acted upon by a force, as described.
Momentum is a quantity which is used for measuring motion of an object. An object's
momentum is directly related to the object's mass and velocity, and the total momentum of
all objects in an isolated system (one not affected by external forces) does not change with
time, as described by the law of conservation of momentum.
As there is no absolute frame of reference, absolute motion cannot be determined.Thus,
everything in the universe can be considered to be moving.
Motion applies to objects, bodies, and matter particles, to radiation, radiation fields and
radiation particles, and to space, its curvature and space-time. One can also speak of
motion of shapes and boundaries. So, the term motion in general signifies a continuous
change in the configuration of a physical system. For example, one can talk about motion of a
wave or about motion of a quantum particle, where the configuration consists of
probabilities of occupying specific positions.
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