3.5

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The Nature and Status of Physical Equations Since physics is primarily an exact (quantitative) discipline, much of our work is concerned with equations. We can distinguish the following types. (a) Defining equations. These were identified in the previous section. It helps if we all use technical terms with the same meaning, and so to reduce confusion defining equations must be learned. (b) Laws. Equations representing laws were discussed in paragraph 1.1. These too must be learned, since they often represent the result of experiment, and so cannot be simply deduced. (c) Principles and useful results. There are many equations in physics that summarize the application of laws and defining equations to common situations. The following are well-known examples:

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