Internal forces acting in a system of particl | vedclass

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Question

(A) According to Newton's third law,internal forces always exist in equal and opposite pairs. Since the sum of internal forces in a system is always z

Vedclass · Accepted Answer

The kinetic energy but not linear momentum of the system

Vedclass · Answer

(A) According to Newton's third law,internal forces always exist in equal and opposite pairs. Since the sum of internal forces in a system is always zero,the net force on the system due to internal forces is zero. According to the impulse-momentum theorem,$\vec{F}_{ext} = \frac{d\vec{p}}{dt}$. Since $\vec{F}_{int} = 0$,the total linear momentum $\vec{p}$ of the system remains constant. However,internal forces can perform work on the particles of the system,which changes the internal energy or the kinetic energy of the individual particles. Therefore,internal forces can change the kinetic energy of the system without changing its total linear momentum.

Internal forces acting in a system of particles can change:

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