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Upward force on a object at rest
Is there an upward force on a object at rest? If yes, where does it come from?
user2514
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Conserved quantities in generalized n-body problem
Given a collection of point-particles, interacting through an attractive force $\sim \frac{1}{r^2}$.
Knowing only $m_1a=\sum_i \frac{Gm_1m_i}{r^2}$ and initial conditions we can deduce the motion of ...
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