Question

If a child stands up while swinging on a swing, then what will be the change in time period of the swing? Will it increase or decrease?

Answer 1

Time period of oscillation of simple pendulum -

T=2\$\pi\sqrt{l/g}$

l = length of pendulum  

g = acceleration due to gravity.  

The center of gravity shifted upwards so the length from point of suspension will decrease.