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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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What identifies an action-reaction pair of forces?

The forces exerted on the man (W and R) cancel each other out: they are opposites with same intensities (W - R = 0). The man doesn't move with respect to the lift. …
Ludovic Kuty's user avatar