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Newton’s third law states that forces always exist in equal and opposite pairs. One object cannot exert a force on another without experiencing an equal magnitude force in the opposite direction. Newton’s third law applies even if the two interacting objects have different masses. The equal and opposite forces in the pair do not cancel because they act on different objects.

Sections:
00:00 – Newton’s third law with examples
02:42 – Newton’s third law and acceleration
04:11 – Why don’t equal and opposite forces cancel out?
05:36 – What is action and reaction?
07:00 – Applying Newton’s third law

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