1. The problem statement, all variables and given/known data A 10.0 kg sphere is attached to the incline by a horizontal string. Whats the tension in the string. 2. Relevant equations sum of all horizontal forces = 0 sum of all vertical forces = 0 sum of all torques = 0 3. The attempt at a solution The sum of the horizontal forces is -Tsin55 degrees - F + mgsin35 degrees = 0 Why does F= T???? I know F= T because when I substitute F=T and solve for T I get the right answer (30 .9 N) but why is this?