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Grade 11Mechanics

A system of N particles is free from any external forces.
(a) Which of the following is true for the magnitude of the total momentum of the system?
(A) It must be zero.
(B) It could be non-zero, but it must be constant.
(C) It could be non-zero, and it might not be constant.
(D) The answer depends on the nature of the internal forces in the system.
(b) Which of the following must be true for the sum of the magnitudes of the momenta of the individual particles in the system?
(A) It must be zero.
(B) It could be non-zero, but it must be constant.
(C) It could be non-zero, and it might not be constant.
(D) It could be zero, even if the magnitude of the total momentum is not zero.

Profile image of Simran Bhatia
11 Years agoGrade 11
Answers icon

1 Answer

Profile image of Aditi Chauhan
11 Years ago
The correct option is:
.(a) (B) It could be non-zero, but it must be constant.
.(b) (B) It could be non-zero, but it must be constant.
(a) The total momentum of the system is given as:
236-9_1.PNG 236-922_1.PNG

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