COMEDK · Physics · 5. Laws of Motion
If the resultant of all external forces acting on a system of particles is zero, then from an inertial frame one can surely say that
- A Potential energy of the system does not change in time.
- B Kinetic energy of the system does not change in time.
- C Angular momentum of the system does not change in time
- D Linear momentum of the system does not change in time
Answer & Solution
Correct Answer
(D) Linear momentum of the system does not change in time
Step-by-step Solution
Detailed explanation
The net external force acting on a system of particles is given by the rate of change of the total linear momentum of the system, expressed as \(\vec{F}_{ext} = \dfrac{d\vec{P}}{dt}\). Given that the resultant of all external forces is zero, \(\vec{F}_{ext} = 0\). Substituting…
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