NEWTON’S LAWS OF MOTION Part 2 Newton’s Third Law Newton’s Third Law • For every action, there is an equal and opposite reaction What will happen to the skateboard? For every action, there is an equal and opposite reaction • In rocketry…… The gases being expelled is the action. The rocket propelling forward is the reaction. Example How do Newton’s laws describe the motorcycle rider? • 1st: Inertia keeps the rider moving forward. • 2nd: The force with which the rider hits the ground will be equal to his mass times his deceleration. • 3rd: The action of hitting the ground will equal the reaction of the dirt.