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Newton’s 3rd law of motion 2014 (1)

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Laura Smith
Laura Smith

Newton's third law of motion states that for every action, there is an equal and opposite reaction. It explains that in all interactions, there is a pair of forces acting on two different objects. The document provides examples of this, including a person pushing on a wall, a bee flying, and a rocket launching. It notes that while the forces are equal, they do not cancel out or balance since they act on different objects that undergo motion.

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Newton’s 3rd Law of Motion 8TH GRADE SCIENCE
Newton’s 3rd Law of Motion • AKA “law of action/reaction” • States that for every action force there is an equal but opposite reaction force • Forces always occur in pairs, equal but opposite
Example: • 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. • Either force can be considered the action force or the reaction force.
Equal and Opposite – NOT BALANCED • Action and reaction force pairs don’t cancel because they act on different objects. The critter is applying an action force on the wall, the wall is applying a reaction force on the critter.
How does it affect me? • 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
What about the world around me? • When a bee flies, its wings push in a downward and a backward direction. • By Newton’s third law, the air pushes back on the bee in the opposite directions—upward and forward. • This force keeps a bee in the air and propels it forward.
Mass Matters Larger Mass • When you walk forward, you push backward on the ground. • Your shoe pushes Earth backward, and Earth pushes your shoe forward. • Why do you move forward instead of the Earth moving back? Smaller Mass • Take 30 second to discuss the following with your shoulder partner • What happens if you step on something that has less mass than you? (maybe a skateboard)
That’s how rockets work? • 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. • What are the action and reaction forces in the rocket launch?
•This downward push is the action 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.
Product: • How do action/reaction forces compare to balanced forces? • You have two minutes to brainstorm on your own • You have one minute to discuss with your shoulder partner • You have five minutes to compose your answer in complete sentences. • Brainstorm • Discuss • Compose

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Newton’s 3rd law of motion 2014 (1)

  • 1. Newton’s 3rd Law of Motion 8TH GRADE SCIENCE
  • 2. Newton’s 3rd Law of Motion • AKA “law of action/reaction” • States that for every action force there is an equal but opposite reaction force • Forces always occur in pairs, equal but opposite
  • 3. Example: • 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. • Either force can be considered the action force or the reaction force.
  • 4. Equal and Opposite – NOT BALANCED • Action and reaction force pairs don’t cancel because they act on different objects. The critter is applying an action force on the wall, the wall is applying a reaction force on the critter.
  • 5. How does it affect me? • 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
  • 6. What about the world around me? • When a bee flies, its wings push in a downward and a backward direction. • By Newton’s third law, the air pushes back on the bee in the opposite directions—upward and forward. • This force keeps a bee in the air and propels it forward.
  • 7. Mass Matters Larger Mass • When you walk forward, you push backward on the ground. • Your shoe pushes Earth backward, and Earth pushes your shoe forward. • Why do you move forward instead of the Earth moving back? Smaller Mass • Take 30 second to discuss the following with your shoulder partner • What happens if you step on something that has less mass than you? (maybe a skateboard)
  • 8. That’s how rockets work? • 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. • What are the action and reaction forces in the rocket launch?
  • 9. •This downward push is the action 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.
  • 10. Product: • How do action/reaction forces compare to balanced forces? • You have two minutes to brainstorm on your own • You have one minute to discuss with your shoulder partner • You have five minutes to compose your answer in complete sentences. • Brainstorm • Discuss • Compose