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Nov9-12, 05:39 AM
P: 696
If you conceptualize force as rate of transfer of momentum then you run into difficulty in scenarios where force is present but no transfer of momentum is taking place. An example would be leaning against a wall. There is a force between me and the wall, and an equal and opposite force between my shoes and the floor. The net force on me, as a whole, is zero but the forces are not applied in the same place which creates strain on both me and the floor/wall.