The book An Elementary Treatise On Kinematics And Dynamics was written by author James Gordon Macgregor Here you can read free online of An Elementary Treatise On Kinematics And Dynamics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Elementary Treatise On Kinematics And Dynamics a good or bad book?
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If the ^B stones used were of equal mass, they will be found equal. If not, it will be found that 308] THE LAWS OF MOTION. 203 if If, m are the masses of the respective stones, then M.AB = in.ab. Now the product of the mass of a body (294 and 117) into its integral acceleration measures the impulse of aforce. Hence the stones during collision have experienced equal impulses in opposite directions. Other simple experiinents give the same result and suggest a third law of motion, which Newton enu...nciated as follows : — To every action there is always an equal and contrary reaction; or the Tnutual actions of any two bodies are always equal and oppositely directed. The exertion of a force upon one body is thus only a one-sided view of a more complex phenomenon, viz., the simultaneous exertion of equal and opposite forces upon two bodies. When we are thinking of a force as acting not on one body, but between two bodies, we call it a stress. When the stress is such as to make the bodies move towards one another it is called an attraction or a tension ; when its effect is to increase their distance it is called a repulsion or a pressure (see 306).
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