Newton's Laws of Motion
1st Law of Inertia- An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2nd Law of Acceleration- Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
3rd Law of Action/Reaction-For every action, there is an equal but opposite reaction.