Newton's Law
Newton’s First Law
Newton’s First Law states: an object moves in a straight line and at constant speed except to the extent that it interacts with other objects
Meaning with no interaction, a moving object will continue to move in a straight line
This is also known as The Law of Inertia
inertia: in a sense, the resistance of change in motion
example: bowling ball vs ping pong ball – which one takes more force to move?
Newton’s Second Law
Newton’s Second Law states: the momentum of a system does not change unless a net external force acts on it
This is also known as The Momentum Principle
Click the link above for an interactive browser exercise to practice with forces.
Newton’s Third Law
Newton’s Third Law states: for every action, there is an equal and opposite reaction
reciprocity: the idea that the force that object 1 exerts on object 2 is equal and opposite to the force that object 2 exerts on object 1