2-17

Mr. Manning started off the class period with a daily question:  Kinetic Energy is an active or moving form of mechanical Energy. Does an object need to be stationary to have potential energy ? Answer: No, an object (such as a swing) can be above the ground and be moving from side to side, yet still have potential energy.

After discussing the daily question, the class reviewed the homework from over the weekend: The Conservation of Energy & Work Notes then took notes on the CONSERVATION OF ENERGY. key points: Etot does __//**NOT**//__ change. Etot=Ek+Ep Ek+Ep= Ek+Ep. ( initial = final )

To demonstrate this, Mr. Manning took a bowling ball hanging from a wire and held it up to his face, right infront of his nose and let the ball drop. He did not move, and when the bowling ball swung back, it did not hit Mr. Manning's face, but came back to it's original position; right in front of his nose. This demontration showed the concept of the conservation of energy, and Mr. Manning did not flinch because he knew the bowling ball would not hit his face. However, if he had put any extra energy into letting the ball go, it would have hit him!



For the remainder of class, the students worked on the handout/ homework, pg. 19&20. //**Conservation of Energy Problems**//