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Writing Prompt: 10/26/2006

Writing Prompt: 10/26/2006. Predict what will happen if a 250 lb. safety runs into a 140 lb. punt returner who was standing still to catch a punt during a football game? Write down what will happen to the safety and what will happen to the returner (think about speed and motion). Momentum.

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Writing Prompt: 10/26/2006

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  1. Writing Prompt: 10/26/2006 • Predict what will happen if a 250 lb. safety runs into a 140 lb. punt returner who was standing still to catch a punt during a football game? • Write down what will happen to the safety and what will happen to the returner (think about speed and motion)

  2. Momentum Transfers and Collisions

  3. Momentum • What is it? • In general terms: It is when an object picks up speed. To gain momentum you are gaining speed.

  4. Momentum • What is it? • Mathematically: Momentum = Mass X Velocity p = mv = constant (lower case “p” stands for momentum)

  5. Momentum • What is the unit for momentum? Momentum = Mass X Velocity Mass (kg) X Velocity (m/s) = kg-m/s Unit is a “kilogram meter per second”

  6. Momentum • QUESTION: What is the momentum of a 60 kg Running back running at 3 m/s? • ANSWER: 60 kg x 3 m/s = 180 kg-m/s

  7. Conservation of Momentum • Collisions: Two different types • Elastic: Colliding objects DON’T stick together • Example: Bouncing a ball • Plastic: Colliding objects combine into a single object • Example: Firing a bullet into a wood block

  8. Conservation of Momentum • If a collision occurs, MOMENTUM IS CONSERVED!!! • Example: If the van hits the car, the final momentum of the two cars will equal their initial momentum!!!

  9. Conservation of Momentum • Let’s see a demonstration…

  10. Conservation of Momentum • QUESTION: What is the final momentum if a 100 kg cart moving at 3m/s hits another 100 kg cart that isn’t moving and they stick together? • ANSWER: 300 kg-m/s 100 x 3 + 100 x 0 = 300

  11. Conservation of Momentum • QUESTION: What is the final VELOCITY of the system if a 100 kg cart moving at 3m/s hits another 100 kg cart that isn’t moving and they stick together? • ANSWER: 1.5 m/s 300 kg-m/s = m x v = 200 kg x v v = 300/200 = 1.5

  12. Conservation of Momentum • Let’s see another demo…

  13. Conservation of Momentum • Answer the following questions in your comp book from Mr. Darling

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