Summary: The topic of the LO is Simple Pendulum. We know the mass m, length of the string L and angle respect to the equilibrium position. We try to calculate following values: 1. the displacement from original position to the equilibrium. 2. The tension of the string. 3. the tangential component of the acceleration. 4 The angular frequency of this simple harmonic motion.

https://blogs.ubc.ca/phys101/files/gravity_forms/1-72f8f8fec225ededbd95c074100f3d9f/2015/02/photo1.jpg