Question

A child swinging on a swing in sitting position, stands up, then the time period of swing will

• A. increase
• B. decrease
• C. remain same
• D. increase if the child is long and decrease if the child is short

Answer 1

Answer: (B)

decrease

Answer 2

As the girl stands up, the effective length of pendulum decreases due to the reason that the centre of gravity rises up so, according to $T=2\pi \sqrt{\frac{l}{g}}$ T will decrease.