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Newtonian mechanics covers the discussion of the movement of classical bodies under the influence of forces by making use of Newton’s three laws. For more general discussion of energy, momentum conservation etc., use classical-mechanics, for Newton’s description of gravity, use newtonian-gravity.

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In addition to james large's answer, you can also see the center of gravity as the intersection of all the vertical lines when you hang your solid by any point. (link from http://www.splung.com)
answered Oct 6 '15 by anderstood
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1answer
What is the physical meaning of the eigenvectors of the mass matrix? If I consider a 2-dof system with one mass linked to two orthogonal springs and I write the equations in any orthogonal system of …
asked Oct 5 '15 by anderstood
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I'm breaking your question into parts to identify what confuses you: so $F=kma$ where $k$ is a constant OK until there. They say we choose unit of force such that it produces acceleration of …
answered Feb 26 by anderstood
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1answer
Using a "successive impact model" (as if each ball were seperated from the other ones), I produced the following animations: You can see any combination of balls with masses of 1 or 2 (left) or 1 a …
asked Jun 16 '16 by anderstood
2
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1answer
Consider a unforced, undamped, linear mechanical system with a finite number of degrees of freedom. Its (second order) dynamical equations can be gathered in a matrix equation $$M\ddot X + K X=0$$ T …
asked Oct 2 '15 by anderstood
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. . . just because I haven't encountered such a phenomenon in everyday life . . . In addition to the existing answers, a common example of the form $x'' + \alpha x=0$ with $\alpha<0$ in physics …
answered Mar 5 by anderstood
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2answers
In fluid mechanics, the stress tensor writes $\sigma = -p 1 + \tau$ where the deviatoric part $\tau$ corresponds to shear. The viscous (volumic) forces are $\operatorname{div}\tau$. For a Newtonian f …
asked Jan 25 '16 by anderstood
2
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1answer
In all structural dynamics applications I have seen, the motion is mostly governed by low frequency modes. For example, a pretty accurate approximation of buildings dynamics can be obtained with the t …
asked Sep 15 '17 by anderstood
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The rotation period $T$ is given by $$T=2\pi \sqrt{\dfrac{a^3}{G(M_\text{Sun}+M_\text{planet})}}$$ where $a$ is the sum of the half axes of the ellipse. Routhly: $M_\text{Sun}=2\times 10^{30}$ kg $ …
answered Apr 27 '15 by anderstood