Momentum and CollisionMediumBloom L3
Question
A system of N particles is free from any external forces.
(i) Which of the following is true for the magnitude of the total momentum of the system?
Options
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
Solution
Sol. (1) ${\bar{f}}_{ext} = 0$
$\Rightarrow {\bar{P}}_{system}$⇒ conserved
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