"Force cannot be explained without stating a law of nature concerning momentum, viz.:— Suppose a body with a certain momentum to be the only body in the universe; it will go on with the same momentum. The case of bodies in contact is no exception to this law, but only a particular case. Here the change of motion is called pressure. The case of bodies not in contact is illustrated by the motion of the earth about the sun [under the force of gravitation, as we call it]. In all cases change of motion is connected by invariable laws with the position of surrounding bodies. Force, then, has a definite direction [at every instant] at any point in space, and depends on the position of surrounding bodies, and may be described as the change of momentum of a body considered as depending upon its position relative to other things. It embodies the quality of direction as well as magnitude. In other words, it is a quantity having direction."
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Atheists from EnglandUniversity of Cambridge alumniPhilosophers from EnglandUniversity of Cambridge facultyMathematicians from England
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William Kingdon Clifford
William Kingdon Clifford (May 4, 1845 – March 3, 1879) was an English mathematician and philosopher.
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