Ch. 3 & 4 Motion & Forces I. Newton’s Laws of Motion “If I have seen far, it is because I have stood on the shoulders of giants.” - Sir Isaac Newton (referring to Galileo)

A. Newton’s First Law Newton’s First Law of Motion  An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force.

B. Newton’s Second Law Newton’s Second Law of Motion  The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. F = ma

C. Newton’s Third Law Newton’s Third Law of Motion  When one object exerts a force on a second object, the second object exerts an equal but opposite force on the first.