Question

How is the acceleration of gravity calculated for planets?

Answer 1

You can use the expression of gravitational force.

Explanation:

We use a bit of the expression of Gravitational Force (in red):
`F_g=color(red)(G)*(mcolor(red)(M))/color(red)(r^2)`
Where:
`G` is the Universal Gravitational Constant;
`M` is the mass of the planet;
`r` is the radius of the planet.
(You can find these values in the literature).
Try with Earth you should find `9.8m/s^2`.
For other planets simply choose the specific `M` and `r`.