Question

What is a simple pendulum?Define the factors on which time period depends?

ICSE Class 9 Physics Chapter Measurements and Experimentation

Answer 1

A heavy particle suspended by a weightless and inextensible string and oscillating freely without friction about a point, to which the upper end of the string is fixed, constitutes a simple pendulum.

The factors affecting the time period of a pendulum are:-
(i)Length of the pendulum: The time period varies directly with the square root fo the length of the simple pendulum. Effective length of a S.P. means the length between the point of suspension and the centre of the bob. 
(ii)Acceleration due to gravity: The time period varies inversely with the square root of the acceleration due to gravity.