Experiments
المؤلف:
GEORGE A. HOADLEY
المصدر:
Essentials of Physics
الجزء والصفحة:
p-12
2025-10-18
218
An experiment is a question put to nature, and the results obtained by it are her answer. If the conditions are the same, it is found that to a given question nature always makes the same answer, and thus we learn that the order of nature is constant; or that she has definite laws by which she works. A careful study of the experiments described in the text for class demonstrations, attended by practical work in the laboratory, will show the student in how great variety the questions can be asked, and will show that every changed condition has its own effect.
It is by means of experiments that physicists have discovered the laws of physics. In interpreting the results of various experiments an hypothesis is formed to explain these results. When the hypothesis is found to account satisfactorily for all the observed facts, it becomes an accepted theory; when this theory is established so firmly that it cannot be overthrown, it is the expression of physical law.
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