First slide

Second law

Question

Internal forces can change

Moderate

A

the linear momentum but not the kinetic energy
B

the kinetic energy but not the linear momentum
C

linear momentum as well as kinetic energy
D

neither the linear momentum nor the kinetic energy.

Solution

Internal forces on a system of interacting particles cancel out as they are action reaction pairs. Hence internal forces cannot produce acceleration of centre of mass. So they cannot change momentum of the system as a whole. But since net internal force on a particle is not zero, velocity i.e, K.E of particle can change.

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