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Almost all theories of physics have expressed physical laws by means ofdifferential equations. One can ask: why differential equations? What isspecial about them? This article addresses these questions and is presented asan inquiry-based lecture, where students and a teacher are engaged indiscussion. It has two goals: (1) To help undergraduate students understand therationale behind the use of differential equations in physics, (2) To show howmeaningful and interactive presentation of mathematics can help students takepleasure in learning physics.

Why are differential equations used for expressing the laws of physics?