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Highly selective Backlog Qs for JEE MainPhysicsCenter of Mass, Momentum and Collision

For a system to follow the law of conservation of linear momentum during a collision , the condition is (1) Total external force acting on the system is zero. (2) Total external force acting on the system finite and time of collision is negligible. (3) Total internal force acting on the system is zero.

Options

  1. A(1) only
  2. B(2) only
  3. C(3) only
  4. D(1) and (2)

Correct answer

A. (1) only

Step-by-step solution

From Newton's second law, F = d p d t If F = 0 ,then d p d t = 0 ⇒ p = constant Thus, if total external force acting on the system is zero, then linear momentum of the system remains conserved.

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