Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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Two Blocks of Unequal Masses Are Tied by a Spring. the Blocks Are Pulled Stretching the Spring Slightly and the System is Released on a Frictionless Horizontal - Physics

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Short Note

Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? If yes, is it an example of Newton's third law?

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Yes, the forces due to the spring on the two blocks are equal and opposite.
But it's not an example of Newton's third law because there are three objects (2 blocks + 1 spring). Spring force on one block and force by the same block on the spring is an action-reaction pair.

Concept: Newton's Third Law of Motion
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HC Verma Class 11, Class 12 Concepts of Physics Vol. 1
Chapter 5 Newton's Laws of Motion
Short Answers | Q 15 | Page 77
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