Today we learned about forces with two objects when they aren't in a state of equilibrium. This could be shown using two objects, like a large heavy bottle and a smaller can. If I push the bottle that is touching the can, the friction from the table will push back on the bottle and can. The bottle pushes me because I am pushing it (forces are equal and opposite because of Newtons third law).
The bottle and can would not have moved and remained at constant velocity (0) had I not pushed the bottle. The can pushes back and the bottle pushes the can. I am the unbalanced force that unbalances the equilibrium, because of Newtons second law.
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