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น่านมันกฏข้อที่ 3 ครับ
Newton's Zeroth Law: An Asymmetric Convention of Physicists
Introductory students are often confused as to what forces to consider when analyzing an object's motion. We assist them by articulating "Newton's zeroth law:" Objects respond only to the forces they feel at the instant they feel them. This rule helps combat the common intuition that objects move in response to forces they exert (i.e., a swimmer moves by pushing herself off the wall of a pool). Surprisingly, however, the students' alternative intuition is potentially just as valid as the traditional physics formulation. We could replace the forces appearing Newton's second law with their third-law complements, introducing a minus sign, to express the alternative that "objects respond to the forces that they exert at the moment that they exert them." The resulting net force, exerted by the object instead of acting on it, would be opposite the acceleration of the object, as indicated by the minus sign.
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Jetology 
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29 ต.ค. 55 20:20:51
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