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# A Level M1 Newtons Law Questions

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1. Hi,
So in M1 (aqa) when calculating tension you can use either T - mg = ma or mg - T = ma. But I am not sure when to use which one. I know that it has something to do with tension being the greatest force or something.

Any help will be appreciated.
2. The equation shows that the net force is equal to ma, so if tension is larger than weight, the resultant force will be in the direction of the tension, so T - mg = ma. If weight was larger, the opposite would be true,
3. (Original post by JN17)
The equation shows that the net force is equal to ma, so if tension is larger than weight, the resultant force will be in the direction of the tension, so T - mg = ma. If weight was larger, the opposite would be true,
Thanks for the reply, I found out which way around the equations should be.

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