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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.
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