Laws of simple pendulum

1) law of length : the period of simple pendulum is directly proportional to under root of its length


2) law of gravity : the period of simple pendulum is inversaly proportional to under root of gravity


3) law of mass : the period of simple pendulum is does not depend upon its mass


4) law of Isochromous :  the period of the pendulum it does not depend upon its amplitude of oscillation