How to solve tension problems with angles. To solve these we simply draw free body diagrams for all the forces and create a system of force equations to solve. This is a common type of problem on the AP Physics C: Mechanics test.

This particular video goes over a classic hanging sign with mass problem and also a problem known as the accelerometer. The accelerometer is a device used in physics to know the acceleration of an object based on the angle that a hanging mass makes with the vertical. It's a common physics problem.