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Table. 1.

Explanations about the period of the simple pendulum in Physics II Textbooks (n= 5).

Explanation No. of textbooks
Comparison with simple harmonic oscillator. (The period of a simple harmonic oscillator is derived through comparison with the circular motion.) 3
Directly providing formulas without derivation. 1
Only proportional expressions through experiments are provided. 1
New Phys.: Sae Mulli 2023;73:37~43 https://doi.org/10.3938/NPSM.73.37
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