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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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Newton's third law, opposite force with a wall vs a floor

You should think about all the forces acting on the object: we have the gravitational force $F_g$ downwards between the object and the Earth, and the normal force $F_n$ upwards applied by the floor to …
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