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ERIC Number: EJ901537
Record Type: Journal
Publication Date: 2010-Sep
Pages: 13
Abstractor: As Provided
Reference Count: 9
ISBN: N/A
ISSN: ISSN-0143-0807
Towards a More Realistic Description of Swing Pumping Due to the Exchange of Angular Momentum
Roura, P.; Gonzalez, J. A.
European Journal of Physics, v31 n5 p1195-1207 Sep 2010
The pumping mechanism of a swing in a playground is due to the exchange of angular momentum from the rocking movement of the swinger to the swing oscillation around the point from which the swing is suspended. We describe the rocking events as square pulses of short duration. This choice, together with a simplified mechanical model for the swinger, leads to simple formulae for the amplitude gain of the swing per rocking event. We show that the maximum gain is achieved when there is rocking at the swing return points, which is a usual way of swinging. At these points, for pulses that are short enough, the gain is proportional to the angle rocked and is almost independent of the pulse duration. The results describe reasonably well the gain per pulse measured in a realistic experiment. (Contains 10 figures.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail: info@ioppubusa.com; Web site: http://www.iop.org/EJ/journal/EJP
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A