Final Crossword Puzzle

2. The motion of an object can often be described differently depending on the ___ frame.
10. Unbalanced forces cause an object to ___ in the direction of the net force.
12. Newton's second law of motion explains the ___ among force, mass, and acceleration.
13. Within our solar system are ___ major planets, grouped by proximity to the Sun.
14. A ___ is a push or pull that is exerted on an object.
15. ___ energy is energy in the form of motion.
16. The reason why we have seasons is because the Earth is ___.
17. Newton's third law states that for every action, there is an equal and opposite ___.
18. Eclipses only occur when all three celestial bodies line up in the same ___.
19. During a ___ cycle, we can observe different phases of the moon.
20. An __ is an imaginary line about which each planet or moon spins.

1. Gravity is always a ___, never a push.
3. The planets' orbits are ___, or oval shaped.
4. Between Mars and Jupiter lies the ___ belt.
5. Before the ____ model, people used to believe in the heliocentric model.
6. The two things that affect the strength of the gravitational force between two objects are ____ and distance.
7. If all the forces acting on a particular object are balanced, then the net force is ___.
8. ___ energy is stored energy.
9. ___is a force that pulls every object toward every other object.
11. The law of ___ states that energy can be neither created nor destroyed, only transferred from one form or object to another.