Physics Help Forum Why is tension added with mg?

 Energy and Work Energy and Work Physics Help Forum

 Apr 29th 2017, 01:39 AM #1 Junior Member   Join Date: Apr 2017 Posts: 2 Why is tension added with mg? Why is my teacher saying that T = mg + ma = 24 N? Shouldn't it simply be 4 N? Link to the question https://ibb.co/dHiDkk
 Apr 29th 2017, 09:26 AM #2 Senior Member     Join Date: Aug 2008 Posts: 110 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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