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Newton’s 3 rd Law and Momentum

Newton’s 3 rd Law and Momentum. Chapter 10 Section 4. Newton’s 3 rd Law of Motion. If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction . What does that mean?

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Newton’s 3 rd Law and Momentum

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  1. Newton’s 3rd Lawand Momentum Chapter 10 Section 4

  2. Newton’s 3rd Law of Motion If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction. What does that mean? For every ACTION…there is an equal and opposite REACTION!

  3. Action-Reaction Pairs

  4. When the gymnast does a flip, she pushes down on the vaulting horse (action force). The reaction force of the vaulting horse pushes her up to complete the flip.

  5. Do Action-Reaction Forces cancel each other out? NO! The Action-Reaction Forcesact on different objects.

  6. Momentum! Quantity of Motion Momentum = Mass x Velocity Kg x m/s Momentum is a vector quantity Momentum of an object is in the same direction as its velocity

  7. If a bicycle and a fire engine are both moving at a speed of 5 km/hr, which would be easier to stop? Why? The Bicycle! It has less mass, and therefore, has less momentum. Momentum = Mass x Velocity • When a car slows down, its velocity decreases and its mass stays the same. How does slowing down affect the car’s momentum? The Momentum Decreases! Momentum= Mass x Velocity!

  8. Math Practice Turn to Textbook page 396 “Math Practice” and complete problems #1-2. Show equation and work!

  9. Conservation of Momentum What does Conservation Mean? The total momentum of any group of objects that interact (collide) remains the same (conserved) unless acted on by some outside force. What is an example of an outside force? Friction!

  10. SEE OVERHEADFOR PICTURES OF DIFFERENT TYPES OF COLLISIONS

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