64R: 15.1 Energy and It’s Forms KE vs PE Forms of Energy Kinetic Energy (KE) Energy of motions, depends on mass and speed of object KE= ½ mv2 Potential Energy (PE) E stored because of position Gravitational PE depends on height , mass, and acceleration due to gravity PE= mgh Elastic PE Stretch/ compress object and it “springs back” Mechanical- E based on motion and position of an object; Ex bouncing ball Thermal-motion of object’s particles; Ex molten metal Chemical-E stored in chemical bonds; Ex food eat/ gas in car Electrical- E of electrical charges; Ex batteries/ plug Electromagnetic- travels in waves; Ex sun’s rays Nuclear- E stored in nucleus of atom; Ex fission/fusion

15.2 Energy Conversion and Conservation Conservation of Energy Energy can be converted from one form to another Most common is when gravitational PE is converted to KE of moving object Pendulums- swing switches KE to PE Pole Vault- KE (running) to elastic PE (pole rises) to gravitational PE (top) to KE (fall) Mechanical energy= KE+PE Law of conservation of Energy- energy cannot be created or destroyed Energy and mass, E=mc2, states that Energy and mass are equivalent/ converted Conservation of Mechanical Energy (KE+PE) beginning = (KE+PE)end

continued 15.3 Energy Resources Nonrenewable Energy Resources Renewable Energy Resources Limited quantities and once used cannot be replaced/ takes too long to replace Can be replaced in short amount of time Hydroelectric Energy from flowing water Solar Electromagnetic rays from sun harvested Geothermal Thermal energy in earth Biomass Chemical energy stored in living things Conserving Energy Conserve energy resources by reducing energy needed or increasing efficiency of energy use

Summary ch 15 Explain how work and energy are related. State the law of conservation of energy and give 2 examples. What are the major renewable and nonrenewable energy sources?