lecture10 - Newtons Third Law For every force, or action...

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If object A exerts a force on object B (an action ”), then object B exerts a force on body A (a “reaction ”). These two forces have the same magnitude but opposite direction. Note: these two forces act on different objects. Newton’s Third Law For every force, or action force , there is an equal but opposite force, or reaction force . BA AB F F A B BA F AB F
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Example: Two carts are put back-to-back on a track. Cart A has a spring-loaded piston; cart B, which has twice the mass of cart A, is entirely passive. When the piston is released, it pushes against cart B, and the carts move apart. Which of the two forces exerted by the two carts on each other has a larger magnitude? 1. The force exerted by A. 2. The two forces have equal magnitude. 3. The force exerted by B. A B It’s a third law pair!! Example: Gravitation. You attract the Earth! F g you,Earth = F gE a r t h , y o u But the acceleration that this produces on the Earth is , m/s 10 kg 10 6 ) m/s 10 )( kg 70 ( weight your 2 22 24 2 Earth M a
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Normal force between book and table N BT = –N TB W BE BT TE
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lecture10 - Newtons Third Law For every force, or action...

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