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# Gravity

- Quantified by Isaac Newton
- Universal attraction among all bodies everywhere
- Gravitational attraction between two objects:
- $F_{gravity} = G \frac{M_1M_2}{R^2}$
- $F_{gravity}$ is the force of gravity between two objects
- $M_1$ and $M_2$ are the masses of two objects
- $R$ is the separation of those objects
- $G$ is the
*universal gravitational constant*

- $F_{gravity} = G \frac{M_1M_2}{R^2}$

## Universal Gravitational Constant

- $6.67 \times 10^{-11} m^3 / (kg s^2)$

## Escape Velocity

- Velocity needed to escape from gravitational pull of an object
- Escaping an orbit of an object
- Formula:
- $v_{escape} = \sqrt{\frac{2GM}{R}}$