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phys: gravitational force 2

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@ -590,6 +590,8 @@ $$F_G=G\frac{mM}{r^2}$$
where $G=6.67×10^{-11} \text{ N}\cdot\text{m}^2\cdot\text{kg}^{-2}$ is Newton's constant of universal gravitation, $r$ is the distance between the objects' **centre of mass**, and $m$ and $M$ are the masses of the objects acted on and acting, respectively.
The net gravitational force acting on an object is equal to the resultant vector formed by components of each force acting on it.
## Resources
- [IB Physics Data Booklet](/resources/g11/ib-physics-data-booklet.pdf)