Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11

# 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

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?

#### Solution

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.

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#### APPEARS IN

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