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Question: Why do you think the door opens, even if it is pushing back at equal force?
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Question: Why do you think the door opens, even if it is pushing back at equal force?

User Zaxliu
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You might think that because action-reaction forces are equal and opposite that they cancel. However, action and reaction force pairs don't cancel because they act on different objects. Forces can cancel only if they act on the same object
User Pierre Capo
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