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?