Newton's Laws

1. First law: The velocity of a body remains constant unless the body is acted upon by an external force.^[3][4][5]
2. Second law: The acceleration a of a body is parallel and directly proportional to the net force F and inversely proportional to the mass m, i.e.,F = ma.
3. Third law: The mutual forces of action and reaction between two bodies are equal, opposite and collinear.