Newton's Laws & Other Basics

For science finals that are going to be the end of me. Nuff said.
1st Law of Motion
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
2nd Law of Motion
The relationship between an object's mass "m", it's acceleration "a", and the applied force "F", is F=ma. In this law, the direction of the force vector is the same as the direction of the acceleration vector.
3rd Law of Motion
For every action, there is an equal and opposite reaction.
Law of Universal Gravitational
Every object in the Universe attracts every other object with a force directed along the line of centers for the two objects that is proportional to the product of their mass and invertly proportional to the square of the separation between the two objects