The end of an inextensible, weightless string. The upper end of string is fixed. Let l be the length of the string, m be the mass of the bob. When the pendulum is deflected by a small angle q and...

The end of an inextensible, weightless string. The upper end of string is fixed. Let l be the length of the string, m be the mass of the bob. When the pendulum is deflected by a small angle q and released, it starts oscillating with frequency f and periodic time T. For small angle of oscillation, the bob performs simple harmonic motion (SHM).