2-20

The Physics Journalist 2-20 Elizabeth Young __Today’s Agenda:__ 1. Pass back papers 2. Review Quiz 3. Review Simulation 4. Work Energy Theorem 5. Sample Problem 6. HW

First of all, if you missed this day, then you need to ask Mr. Manning for papers that he passed back to us. He gave us back our grades for the “I wasn’t speeding” activity. He also gave us back the quiz that we took on Feb. 19. We reviewed the quiz, so if you have any questions about your answers, ask a fellow classmate, or Mr. Manning. We then reviewed the simulations (pg. 21-24). Mr. Manning played the simulations and then we discussed them as a class, and went over the answers. Then we moved on to a new subject!!!!!!!!!!! WORK ENERGY THEOREM!!!!!!!!!!!! It was very exciting stuff. At the beginning of class we picked up two packets (pgs. 25-27, pgs. 28-30). We went over the notes on pgs. 25 and 26, and then we did a sample problem as a class. One of the main things that we discussed about the notes was the difference between conservative and non-conservative forces. Non conservative forces lead to wasted energy. Why is the energy considered wasted? Non-conservative forces create heat, which is a form of energy that can’t be easily transformed back into usable energy. Heat is considered wasted energy. The sample problem was on pg. 27, #1. To solve, use the equation Ep=Ek, which can also be written as mgh=(1/2)mv^2. Just plug in what the problem gives you and solve for velocity. If you have any questions, just ask Mr. Manning or myself. The answer should be 11.713 m/s The rest of the time was given to us to begin our homework, pgs. 28-30