vocab

1. Radial distance from a central point or origin
5. motion where gravity is its only acting force
8. amount of matter in an object
10. a fundamental physical constant that determines the strength of the gravitational force between any two objects
12. Force that draws objects together without physical contact
13. Attractive force between two objects with mass
14. the fundamental force of attraction between any two objects with mass
15. repeating path around a object due to gravity

2. physical quantity's intensity is inversely proportional to the square of the distance from the source
3. the minimum speed an object needs to break free from a celestial body's gravitational pull without further propulsion.
4. Law of Universal Gravitation states that every particle in the universe attracts every other particle with a force
6. a measure of force of gravity on an object
7. Force acting on a body moving in a circular path and is directed towards the center
9. region around a massive object where another massive object would experience a force
11. the average position of all the mass in an object or system, acting as its "balance point"