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Quiz, Elastic PE, Power

Quiz, Elastic PE, Power. Thursday, September 11, 2014. Thursday, 9/11 Unit 2: Work, Power, and Energy. Pick up a calculator or take out your calculator for the quiz. Pick up a red pen (by the black trays) Take out your homework from Tuesday. Upcoming dates

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Quiz, Elastic PE, Power

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  1. Quiz, Elastic PE, Power Thursday, September 11, 2014

  2. Thursday, 9/11 Unit 2: Work, Power, and Energy • Pick up a calculator or take out your calculator for the quiz. • Pick up a red pen (by the black trays) • Take out your homework from Tuesday. • Upcoming dates • ‘B’ day Unit 2 test – Thursday, 9/18 • Last day to turn in 1SW extra credit – Friday, 9/19

  3. Review homework

  4. Quiz • Take out your Energy notes, homework, practice problems, etc. • All phones need to be in your bag (don’t have a bag…put it on my desk) • Remember phone out during a quiz/test = cheating no questions asked. • When you are done with quiz flip your paper over so I know you are done. The quiz will end 15 minutes after we begin.

  5. Elastic Potential Energy • Read the information about potential energy • During your second reading, highlight the following words: • Spring • Elastic • Energy • Potential energy • Stretch • Compress • Force • Spring constant • Equilibrium position

  6. Elastic Potential Energy Example A plastic bullet with a mass of .45 kg is put into a toy gun. The spring in the gun has a spring constant of 200 N/m. The spring is compressed .20 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

  7. Practice problem 1 A plastic bullet with a mass of .20 kg is put into a toy gun. The spring in the gun has a spring constant of 100 N/m. The spring is compressed 4.0 x 10-3 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

  8. Practice problem 2 A plastic bullet with a mass of .35 kg is put into a toy gun. The spring in the gun has a spring constant of 300 N/m. The spring is compressed 6.0 x 10-3 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

  9. Power in Physics • Is a measure of how much work you do in a certain amount of time. • Remember W = F x d • The relationship of power can be analyzed by using the following equation:

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