... from the Manuals of Elementary Science ...MATTERandMOTIONbyJ. CLERK MAXWELL Chapter 2 - On Motion
Web Publication by Mountain Man Graphics, Australia in the Southern Spring of 1995
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Chapter 2 ... ON MOTION
Article 20 ... Definition of Displacement
Article 21 ... Diagram of Displacement
Article 22 ... Relative Displacement
Article 23 ... Uniform Displacement
Article 24 ... On Motion
Article 25 ... On the Continuity of Motion
Article 26 ... On Constant Velocity
Article 27 ... On the Measurement of Velocity when Variable
Article 28 ... Diagram of Velocities
Article 29 ... Properties of the Diagram of Velocities
Article 30 ... Meaning of the Phrase "At Rest"
Article 31 ... On Change of Velocity
Article 32 ... On Acceleration
Article 33 ... On the Rate of Acceleration
Article 34 ... Diagram of Accelerations
Article 35 ... Acceleration a Relative Term
[INDEX to all Chapters][Contents]
The vector which indicates the final position of a point with respect to its position at the epoch is called the Displacement of that point. Thus if A1 is the initial and A2 the final position of the point A, the line A1A2 is the displacement of A, and any vector OA drawn from the origin O parallel and equal to A1A2 indicates this displacement.
This is the kind of displacement which occurs when a body of invariable form moves parallel to itself. It may be called uniform displacement.
When we turn our attention to the process of change itself, as taking place during a certain time and in a continuous manner, the change of configuration is ascribed to the motion of the system.
At any instant during the motion the particle will be found at some one point of the path, and if we select any point of the path, the particle will pass that point once at least during its motion.
This is what is meant by saying that the particle describes a continuous path. The motion of a material particle which has continued existence in time and space is the type and exemplar of every form of continuity.
It is therefore unscientific to distinguish between rest and motion, as between two different states of a body in itself, since it is impossible to speak of a body being at rest or in motion except with reference, express or implied, to some other body.
... from the Manuals of Elementary Science ...MATTERandMOTIONbyJ. CLERK MAXWELL Chapter 2 - On Motion
Web Publication by Mountain Man Graphics, Australia in the Southern Spring of 1995
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