1. 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

2. 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

3. 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

4. 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?