1. + Day 4 – Spring, potential, kinetic energy Mr. Lambert Integrated Science 1A Trimester 1, 2014

2. + Bell Ringer How does the roller coaster today get up to its highest point? (think about the beginning of the ride) Does it cost more to lift the roller coaster if it is full of people?

3. + Agenda 1. Bell Ringer 2. Conservation of energy 3. Spring potential energy lab 4. Exit Slip

4. + Learning Targets On your Bell Ringer Sheet, write the following: We will relate kinetic, spring, and gravitational potential energy to conservation of energy

5. + Law of conservation of energy The total amount of energy in a system remains constant ("is conserved") Energy cannot be created or destroyed. Energy can only be changed from one form to another

6. + Conservation of energy It is impossible to convert one form of energy into another without wasting some energy. Example: Automobile engines typically waste more than two-thirds of the total energy used, primarily through heat. In an isolated system, the energy will remain constant. Example: Thermos, cooler

7. + Reminder… Kinetic energy – energy of movement Potential energy – energy that is stored

8. + Spring potential energy lab Answer questions 1a and 1b.

9. + KE = Kinetic Energy m = mass v = velocity SPE = Spring Potential Energy k = spring constant x = amount of stretch or compression

10. + Fill in the data! TrialsMass (kg)Velocity (m/s)Height (m) GPE at peak height (J) KE just after popping (J) 1 2 Student fill in data How do we get these values? (next slide) Trial 1 = no coin, Trial 2 = one coin

11. + Using the formulas Units for energy are Joules (J)!

12. + Answer questions 5a, 6a, 6b, 6c, 6d

13. + Read #7 on pg. 373 – 374 and fill in the table Position above table (m) SPE (J)KE (J)GPE (J)SPE + KE + GPE (J) At rest on table: Height = 0 m Just after popping: Height = 0 m Half way up: Height = _____ At peak: Height = _____ Each group will go up to the chalkboard and draw a diagram

14. + Energy, Money & Conservation of energy Think of the different types of energy as different types of coins (pennies, dimes, quarters). If you have $5 in quarters in a bowl, and replace one quarter with 25 pennies, how much money is in the bowl? What if you replace two quarters with 10 nickels? The energy in a system can vary from kinetic, to gravitational potential energy to spring potential energy, but the total amount of energy would be the same (CONSERVATION OF ENERGY!!)

15. + 1.When does the toy have the most SPE? 2.When does the toy have the most GPE? 3.When does the toy have the most KE? 4.What kind of energy does the toy have when it is halfway up in the air? Look on pg. 375

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17. + Quick Reading Read the first three paragraphs on page 375 and answer the following questions in your notebook: 1. Even though energy changes from one form to another, what happens to the total energy? 2. Why doesn’t a bouncing ball reach the same height every time it bounces? Why does this still support the conservation of energy? Demo: energy of a basketball

18. + Post-lab questions: Answer questions 4, 6, 9, and 10 Challenge # 7, # 8

19. + Exit Slip 1. A “pop-up” toy has 2 Joules of spring potential energy before popping. How much kinetic energy will the toy have just after leaving the table? 2. Why can the second hill of the roller coaster not be higher than the first hill? 3. When the “pop-up” toy is flying up into the air, what types of energy does it have?