Tension On and Off in Atwood’s Machine : The Advantage of Video Analysis (Journal Article)
Material type:
TextSeries: The Physics Teacher ; Volume 62, Number 1, January 2024Publication details: Washington : American Association of Physics Teachers , , January 2024Description: 32–36pISSN: - 0031-921X
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Abstract: A centuries-old physics experimental apparatus, Atwood’s machine, featured in textbooks, exercise books, and web pages, concerns two hanging masses connected by a string over a pulley. In this paper, we propose the use of the Atwood’s apparatus together with a video analysis of the vertical movement of the hanging masses. By putting an obstacle in the path of the heavier mass, the tension of the string vanishes, and the lighter mass travels for a short while influenced by gravity only, like a projectile. When the string stretches again, the tension reappears, and the former acceleration is recovered.
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