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Old Apr 29th 2017, 01:39 AM   #1
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Why is tension added with mg?



Why is my teacher saying that T = mg + ma = 24 N?

Shouldn't it simply be 4 N?

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Old Apr 29th 2017, 09:26 AM   #2
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because ...

$F_{net} = ma$

Tension is directed upward, force of gravity is directed downward ...

$T - mg = ma$

$T = mg + ma \implies T = m(g+a)$
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