Answer to Question #49867 in Mechanics | Relativity for aakash

Question #49867
does newton's third law is applicable for inelastic substance? how and why?
1
Expert's answer
2014-12-11T06:18:19-0500
No. It’s because we consider a body like amathematical model (inelastic substance).
Newton’s 3st law can appear to be violated(from mechanical point of view) if you can’t see the resulting movement (too
small) of one of the two objects.
Example: Aball heads horizontally toward a wall. While in contact with the wall, the wall
applies a force F, and the ball must apply the same force on the wall F. But we
can’t see the resulting movement of the wall.
But in real wall a ball create littledeformation. The energy of this deformation transforms into heat.
1. Inelasticsubstance is mathematical model. It doesn’t exist in nature.
2. Newton's third law is a consequence of conservationlaws (linear momentum, energy and angular momentum). Newton's laws are
inappropriate for use only in certain circumstances, most notably atvery small scales, very high speeds or very strong gravitational fields.

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