Physics
Mechanics
Easy
Question
If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that
- linear momentum of the system does not change in time
- kinetic energy of the system changes in time
- angular momentum of the system does not change in time
- potential energy of the system does not change in time
The correct answers are: linear momentum of the system does not change in time, kinetic energy of the system changes in time
As external force is zero, P is constant but K.E increases.
Due to external torque, angular momentum changes. P.E also changes.
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