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Grade: upto college level
        
Explain, in terms of angular momentum and rotational inertia, exactly how one "pumps up" a swing in the sitting position. (See "How to Get the Playground Swing Going: A First Lesson in the Mechanics of Rotation," by Jearl Walker, Scientific American, March 1989, p. 106.)
5 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points
							When one sits in the sitting position, the rotational inertia of the body decreases. Since no external torque acts on the swing during this, the change of angular momentum must be conserved. To ensure this, the decrease in rotational inertia of the body must be compensated by increase in angular velocity, and the increased angular velocity eventually pumps up the swing.
5 years ago
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