A girl is swinging on a swing in a sitting position. When the girl stands up, the period of swing will:
✓ Correct answer: a) be shorter
ExplanationWhen a girl is sitting on a swing, her center of mass is lower.When she stands up, her center of mass rises.The period of a swing depends on the length of the swing and the position of the center of mass.The period T of a simple pendulum (which is a good approximation for a swing) is given by the formula: T = 2p L g Where: T is the period (time for one complete oscillation) L is the length of the swing (distance from the pivot point to the center of mass), g is the acceleration due to gravity.When the girl stands, the increased height of the center of mass results in a shorter period (the swing oscillates faster), as the effective length of the pendulum decreases.238
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →