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arXiv · 2605.01554

Smartphone-based measurement of magnetic force and demonstration of Newton third law of motion

Sanjoy Kumar Pal·Soumen Sarkar·Pradipta Panchadhyayee
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Abstract

A fascinating approach to teaching Newton's Third Law using readily available technology is presented in this article. Magnetic forces are measured by using a smartphone's pressure sensor, two ring magnets, and common household items. Students can measure the magnitudes of forces, gain a more tangible understanding of the law, and see how 'action' and 'reaction' are quantitatively equal and opposite.

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Sanjoy Kumar Pal, Soumen Sarkar, Pradipta Panchadhyayee. 2026-05-02. Smartphone-based measurement of magnetic force and demonstration of Newton third law of motion. https://doi.org/10.1119/5.0206524

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