How to calculate the tension?

1. The problem statement, all variables and given/known data

Due to friction, a force of 400 N is required to pull a wooden box on the floor. The cord used to pull the box makes an angle of 56° horizontally.

How much tension should be on the cord to be able to pull the box?

2. Relevant equations

W = Fd * (cosθ)

Tension = Weight +/- Mass * Acceleration ????? (found this one online, but was never taught this) or Ft=m(a+g) (never taught this one either just found it online)

3. The attempt at a solution

I read that to find/calculate tension you should use the second formula but I’m not sure.

Should I convert the Force to mass and then multiply 9.81 m/s2?

http://ift.tt/1eTIUNZ

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