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Understanding Newton’s Third Law of Motion: Action and Reaction Forces

Learn about Newton’s Third Law with readings, notes, activities, and practice. Discover how forces act in equal but opposite pairs and don't cancel out. Explore real-world examples like walking, jumping, and rocket launches.

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Understanding Newton’s Third Law of Motion: Action and Reaction Forces

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  1. Complete the reading on Newton’s Third Law Do Now:

  2. Be able to describe the motion of an object using Newton’s Laws of Motion. • Newton’s Third Law Reading • Newton’s Third Law Notes/ Discussion • Newton’s Third Law Discovery Activity • Newton’s Third Law Practice Agenda: Objective:

  3. Newton’s 3rd Law Law of Action and Reaction

  4. Newton’s Third Law Action and Reaction • According to Newton’s third law of motion, forces always act in equal but opposite pairs.

  5. Newton’s Third Law Action and Reaction • Another way of saying this is for every action, there is an equal but opposite reaction. • This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.

  6. Newton’s Third Law Action and Reaction Forces Don’t Cancel • The forces exerted by two objects on each other are often called an action-reaction force pair. • Either force can be considered the action force or the reaction force. • Action and reaction force pairs DON’T Cancel because they act on different objects.

  7. Newton’s Third Law Action and Reaction Forces Don’t Cancel • You constantly use action-reaction force pairs as you move about. • When you jump, you push down on the ground. • The ground then pushes up on you. It is this upward force that pushes you into the air.

  8. Newton’s Third Law Large and Small Objects • When you walk forward, you push backward on the ground. • The action force is: Your shoe pushes Earth backward. • What is the reaction force? • Earth pushes your shoe forward.

  9. Newton’s Third Law Large and Small Objects • Earth has so much mass compared to you that it does not move noticeably when you push it. • If you step on something that has less mass than you do, like a skateboard, you can see it being pushed back..

  10. Newton’s Third Law A Rocket Launch • When the rocket fuel is ignited, a hot gas is produced. • As the gas molecules collide with the inside engine walls, the walls exert a force that pushes them out of the bottom of the engine.

  11. Newton’s Third Law A Rocket Launch • This downward push is the action force. • What is the reaction force? • The reaction force is the upward push on the rocket engine by the gas molecules. • This is the thrust that propels the rocket upward.

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