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This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.

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Do internal forces always act along the line joining the particles?

For the rate of change of angular momentum of a system to be equal to the torque due to external forces, the torque due to internal forces should be zero. … This will mathematically be possible only when the internal forces act along the line joining the particles. Is this condition valid in all the cases? If not kindly explain with examples. …