Why rigid bodies don't exist in physics and which textbooks explain this

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31 replies · 12K views
Andrew Mason said:
Well, the reason no force propagation can proceed at infinite speed is because it cannot exceed the speed of light. [..]
AM
- that is not classical but relativistic physics: wrong forum
- it completely misses the point, as already explained: infinite force and energy in a piece of matter is unphysical in classical mechanics.
 
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harrylin said:
- that is not classical but relativistic physics: wrong forum
Relativity is part of classical physics.
- it completely misses the point, as already explained: infinite force and energy in a piece of matter is unphysical in classical mechanics.
I disagree. Infinite force is not what is required for a rigid body. Finite force acting instantaneously over a finite distance is what is required.

AM