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Force,” they make a barber’s block,Ready to put onMeanings most strange and various, fit to shockPupils of Newton….The phrases of last century in thisLinger to play tricks—Vis viva and Vis Mortua and Vis Acceleratrix:—Those long-nebbed words that to our text books stillCling by their titles,And from them creep, as entozoa will,Into our vitals.But see! Tait writes in lucid symbols clearOne small equation;And Force becomes of Energy a mereSpace-variation.

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Newton

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