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Dec
27
comment With Newton's third law, why are things capable of moving?
@21Brunoh No particular reason. I just choose to model two main objects, the matchbox and the finger. The choice of "muscles" wasn't particularly important to me. I could have labelled it "arm", or perhaps more sensibly modelled the whole hand or whole arm as one object. I chose finger partly because the question mentioned the force that the box exerts on the finger, but also because I find the sound of the word "finger" more amusing than the alternatives, for no reason I can explain rationally. I'm certainly not saying what you're worried I'm saying, it's just an arbitrary choice of model.
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suggested rejected edit on Why is filling a balloon from your mouth much harder initially?
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comment With Newton's third law, why are things capable of moving?
A nice exercise is to draw the table, matchbox, person and earth and find as many third law matched pairs you can (remember to make sure they're acting on different objects). There's an answer to be found in the revision history of my answer (click the link after the word edited), but I hid it because I feel it distracts from the main part of the answer.
Dec
2
revised With Newton's third law, why are things capable of moving?
The additional diagram didn't add anything, and I felt it was distracting from the main point.
Dec
2
comment With Newton's third law, why are things capable of moving?
@JavierBadia Fixed now. Thanks for pointing out my silly (and ironic) but key mistake. My answer is better now because of your comment.
Dec
2
revised With Newton's third law, why are things capable of moving?
better diagram correcting silly error, additional over-the-top diagram for fun
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comment With Newton's third law, why are things capable of moving?
@StevenLu because I found it funny, particularly "May cause fire.".
Dec
2
revised With Newton's third law, why are things capable of moving?
blue forces are equal by first law!
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answered With Newton's third law, why are things capable of moving?