State the laws of simple pendulum. - Vidyadip

Question

State the laws of simple pendulum.

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Answer

The period of a simple pendulum at a given place is
$\top=2 \pi \sqrt{\frac{L}{g}}$

where L is the length of the simple pendulum and g is the acceleration due to gravity at that place. From the above expression, the laws of simple pendulum are as follows :

(1) Law of length : The period of a simple pendulum at a given place (g constant) is directly proportional to the square root of its length.
$\therefore T \propto \sqrt{L}$
(2) Law of acceleration due to gravity : The period of a simple pendulum of a given length (L constant) is inversely proportional to the square root of the acceleration due to gravity.
$\therefore T \propto \frac{1}{\sqrt{g}}$
(3) Law of mass : The period of a simple pendulum does not depend on the mass or material of the bob of the pendulum.
(4) Law of isochronism : The period of a simple pendulum does not depend on the amplitude of oscillations, provided that the amplitude is small.

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