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ERIC Number: EJ860231
Record Type: Journal
Publication Date: 2008-Mar
Pages: 5
Abstractor: As Provided
Reference Count: 7
ISSN: ISSN-0031-921X
Speed of Wave Pulses in Hooke's Law Media
Huggins, Elisha
Physics Teacher, v46 n3 p142-146 Mar 2008
As students watched a compressional pulse bounce back and forth on the horizontally suspended Slinky[TM], shown in Fig. 1, we wrote down the formula for the speed of the pulse and promised that later in the course we would derive the formula. The problem is we did not keep our promise in the course. Here is where we are keeping the promise. As part of our introduction to Einstein's special theory of relativity, we emphasized that the formula was for the pulse's speed "relative" to the Slinky medium. It would predict the pulse's speed past us only if we were at rest relative to that medium.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A