We can now replace the ambiguous idea of �motion as a whole through space� with the more useful and better defined concept of �center-of-mass motion.� The motion of any rigid body can be cleanly split into rotation and center-of-mass motion. By this definition, the tipping chair does have both rotational and center-of-mass motion. Concentrating on the center of mass motion allows us to make a simplified model of the motion, as if a complicated object like a human body was just a marble or a point-like particle. Science really never deals with reality; it deals with models of reality.
Selasa, 05 Mei 2009
velocity and relative motion
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materi kelas 7
We can now replace the ambiguous idea of �motion as a whole through space� with the more useful and better defined concept of �center-of-mass motion.� The motion of any rigid body can be cleanly split into rotation and center-of-mass motion. By this definition, the tipping chair does have both rotational and center-of-mass motion. Concentrating on the center of mass motion allows us to make a simplified model of the motion, as if a complicated object like a human body was just a marble or a point-like particle. Science really never deals with reality; it deals with models of reality.
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