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Warm-Up:

Warm-Up:. What is the equation for potential energy? What is the equation for kinetic energy?. Potential Energy. Use the equation for PE to answer the following question: PE depends what two things? Mass and height What is the height of an object on the ground?

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Warm-Up:

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  1. Warm-Up: What is the equation for potential energy? What is the equation for kinetic energy?

  2. Potential Energy • Use the equation for PE to answer the following question: • PE depends what two things? • Mass and height • What is the height of an object on the ground? • What is the potential energy of an object on the ground?

  3. Which object has the most potential energy? Support your answer. 5 kg 5 kg 8m 5 kg 5 m 3m 5 kg Which object has the least potential energy? Support your answer.

  4. Which object has the most potential energy? Support your answer. 100 kg 50 kg 5 kg 1 kg 5m 5m 5m 5m Which object has the least potential energy? Support your answer.

  5. Which object has the most potential energy? Support your answer. 5 kg 10 kg 8m 50 kg 5 m 500 kg 3m Which object has the least potential energy? Support your answer.

  6. Kinetic Energy • What two things does KE depend on? • Mass and velocity • Which one has a greater affect on KE? Why? • What happens when velocity is doubled? • How would you approach this problem?

  7. Planes, trains, and automobiles • Which type of energy is demonstrated in the following questions? • A jet plane traveling at 700 mi/hr • How would you solve this problem?

  8. Planes, trains, and automobiles • Which of the two scenarios has MORE potential energy? • (a) a plane on the ground or (b) a the same plane flying through the air? • How would you solve this problem?

  9. Exam Corrections Is it possible to have both potential and kinetic energy? Explain your answer using a SPECIFIC example. How much PE does an object have on the ground? How much PE does a really, really, really big object have on the ground? What happens to KE when velocity doubles? Answer each question in complete sentences. Title this Exam Corrections. Turn it into the Inbox when you are finished.

  10. Heat • What is heat? • What is temperature?

  11. Why is it important to study heat and energy?

  12. Hot Issues & Tough Questions Read the purple handout (these are yours to keep). Tape or staple the green sheet into your notebook and answer the questions.

  13. Hot Issues and Tough Questions • List 1 reason the reading gives for studying heat and energy. • What is the reading describing when it talks about bangers and wigglers? (hint: we learned about these last semester). • What term from our last unit is being transferred when bangers and wigglers collide?

  14. What is heat? A measure of the average kinetic energy of the particles in a sample of matter

  15. What is temperature? The measure of the amount of heat a substance has.

  16. How Heat Travels • Pull out your graphic organizer from last class. • What are the three methods of heat transfer? • Conduction • Convection • Radiation

  17. Purple Sheet Read the first section of the purple sheet. Stop when you get to the first horizontal line. What are the major points of this section?

  18. Purple Sheet • Read the second section on Conduction of the purple sheet. Do not start reading Convection. • What are the major points of this section?

  19. Purple Sheet • Read the third section on Convection of the purple sheet. Do not start reading Radiation. • What are the major points of this section?

  20. Purple Sheet Read the third section on Radiation of the purple sheet. What are the major points of this section?

  21. HOMEWORK: Work on the back of the purple sheet. Whatever you do not finish in class is HW. You may only work with ONE partner. No groups of three. You may listen to music. WE DO HAVE AN EXIT TICKET!

  22. Describe what is going on and how each method of heat transfer works in this example: E X I T T ICKET

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