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Old Feb 20th 2017, 12:18 PM   #1
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What is the diffrence between between rectilinear motion and translatory motion?

can you please answer this question
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Old Feb 20th 2017, 12:21 PM   #2
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"Rectilinear motion" means motion in a straight line or, more generally, a succession of straight lines. "Translatory" motion means any motion from one point to another, as long as the object moving does not rotate.
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Old Feb 20th 2017, 12:24 PM   #3
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The term "rectilinear motion" (or linear motion) means moving in a straight line. "Translatory motion" is when all points in a body move the same distance in the same time - translatory motion does not require that the object move in a straight line. The term "translatory motion" is used with 2- or 3-dimensional bodies, where you could have rotation of the body as it moves, whereas as "rectilinear motion" is often used when considering the moving object as a point.

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Old Feb 21st 2017, 02:57 PM   #4
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Heirachy and Names of Models of Physical Reality

Good chat here. Terminology varies. Whatever "translational" means, it is in description of some physical model of reality. Newton's lowest order model, the first model of physics education, is the "body." I write it as "BODY" to emphasize that it is a "point." I write BODY, BODY... it makes them think "model." BODY is the generic model but "body" is used confusingly elsewhere. (One extension of the model, BODY, is the model, TWO BODY.) I don't recall reading "Translational" used to describe BODY dynamics in physics texts.

The next model some call the extended body (by now I don't need to capitalize). Such systems, accurately depicted, have mass fixed "at a point" with that point placed generally interiorly to the physical "perimeter" of the actual physical entity. Having a "point mass" the extended body has no "interior" rotational physics. This model is used in beginning, pedagogic dynamic analysis of machines. (The term "translational" is used in extended body analysis to mean "all points of an extended body travelling, assumed or actually, on parallel, straight lines).

The mass of connecting rod is distributed over its drop-forged shape. The next model of reality, the rigid body, assumes the rod to be incompressible and the spatial domain to be constant. Center of mass and also moment of inertial are relevant properties.

What's the next model. It is interesting when a system has a center of mass, NOT located in the space of its boundary!

So where is this word used and HOW? I've have looked for a learned writing on "models." Refer me please!

JP
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