Talk:Principle of inertia (physics)
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[edit] Sec. 2.1 "Early understanding of motion": Momentum being caused by motion? WRONG!
I think that it must not be stated in the encyclopedia such a description that diverge from the modern physical knowledge. In classical physics there is no mention of cause at all: it is said that momentum and motion are just connected to eash other, such that they always come together. But in quantum mechanics the operator of momentum is gradient of the wave function; and according to the Schroedinger equation, the spatial motion is caused by the gradient. So actually it comes that momentum is causing motion; and Buridan said almost the same: that impetus is causing motion. I don't know any branch of physics where it would be stated that momentum is caused by motion, except the case of poorly understood beginner's textbook. Fir-tree 00:22, 30 March 2006 (UTC)
