1. Daily Agenda Ms. DeSalvo December 5, 2013

2. CPS Bell Ringer: 12/5/13 Activity: Energy Review 1.What is the unit for energy? 2.T or F? If an object has kinetic energy then it has momentum. 3.Give the equations for kinetic and potential energy. 4.Give an example when PE = 0

3. CPS (Period 6,8) December 5, 2013 Last Class (See me for missed work) Potential, Kinetic, Chemical & Thermal Energy Today Hand in LOL Homework Energy Formulas Working the Problems

4. Kinetic and Potential Energy KE= ½ mv 2 m= mass (kg) v= velocity (m/s) PE= mgh m= mass (kg) g= gravity (9.8m/s2) h= height (m) Total Energy = KE + PE (Conservation of energy)

5. 5 Practice Problem #1 Kinetic Energy A 181 kg motorcycle is traveling at 76 m/s. How much kinetic energy does it have? GUESS

6. 6 Practice Problem #2 Potential Energy How much gravitational potential energy does a 120 kg person have on top of a 25 m building? GUESS

7. 7 Practice Problem A 50-caliber bullet has a mass of 0.045 kg and a KE of 5600 J. What is the velocity of the bullet? GUESS

8. Conservation of Energy As the 2.0-kg pendulum bob in the above diagram swings to and fro, its height and speed change. Use energy equations and the data to determine the blanks in the above diagram. A - __________B - __________C - __________D - __________E - __________ F - __________

9. Physical Science Practice Wkst Work with the person next to you!