Energy_Review forces momentum power resources

Energy

1. Energy The ability to bring about change or do work. Energy Transformation: Change from one type of energy to another. Energy Transfer When a certain form of energy moves to another object.

2. Kinetic Energy: Potential Energy: Energy an object has due to its motion. Energy that is stored in an object. Roller Coaster Showing potential and kinetic energy transformation

3. Which point(s) will have the maximum potential energy? Which point(s) will have the least potential energy? Which point(s) will have the maximum kinetic energy? Which point(s) will have both kinetic and potential energy? A C and then E A B D E C and then E B and D C A

4. Gravitational Potential Energy Is a type of potential energy considering the and objects _______ and _______. Which skier has more GPE? Why? The more mass = More or Less GPE The more distance = More or Less GPE mass height I have more GPE because we have the same mass , but I am at a greater height! You are correct I am lower!

5. Temperature Is the measure of the average kinetic energy (energy of motion) or average speed of all the particles in a material. Higher temperature = particles move faster and farther apart Lower temperature = particles move slower and closer together Which water is hotter? Hotter water particles moving faster and farther apart; blue dye spread out quickly Cooler water particles moving slower and close together; take longer for blue dye to spread

6. An object does not “have” heat Is the transfer of energy from a place with higher temperature to a place of lower temperature. Heat

7. Thermal Energy Thermal energy is the energy a substance or system has related to its temperature , i.e., the energy of moving or vibrating molecules.  Atoms and molecules, the smallest particles of any substance, are always in motion.  The motion of thermal energy is usually not visible, but we can feel or see its effects.  We use thermal energy to cook our food and heat our homes, and we use it to generate electricity. Total kinetic energy of all the particles in a material More molecules = more thermal energy Almost always released (not lost or destroyed) during an energy transformation- felt has heat

8. Can you have the same temperature water but have different amounts of thermal energy? YES more atoms, more thermal energy less atoms, less thermal energy

9. Law of Conservation of Energy The total amount of energy before something happens must be equal to the amount afterward Energy can be transferred or transformed but can not be created or destroyed Total energy does not change True or False : A friend tells you that a generator “makes” electricity.

10. Energy Efficiency No energy transformation results in 100% useful energy Ratio of useful energy to that is released to the total energy used Example: Gas in car 74% of energy released as heat 26% of energy is transformed into motion Engines efficiency= 26%

11. Continuing supply supplied faster than it is used up! Limited supply once it is used up there is no more of it! Renewable Resources Nonrenewable Resources Wind Energy Geothermal Energy Biomass Energy Tidal Harness Solar Energy Nuclear Energy Fossil Fuels (coal, petroleum, natural gas) Renewable and Nonrenewable Resources Hydroelectric Energy