# Laws of Motion

1. Every object will stay in a state of rest or motion unless an outside force acts on it
2. Change of motion of a body is proportional to and in the direction of the force acting on it
• $\Sigma\vec{F} = m\vec{a}$
• If you want to accelerate anything, you have to apply a force
3. For every action there is an equal and opposite reaction
• Mutual actions of two bodies upon each other are always equal and act in opposite directions
• The "action" force and the "reaction" force are acting on different objects
• $\vec{F}{AB} = -\vec{F}{BA}$

Physics