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science
| Term | Definition |
|---|---|
| energy | the ability to do work energy |
| joules | energy is measured in joules |
| power | power is the rate at which energy is transferred from one object to another |
| energy transformation | is when there is a change from one energy to another ` |
| law of conservation of energy | energy can not be created or destroyed it can only be converted from one form to another. Example: when you rub your hands together you are converting mechanical energy( movement) to thermal energy( heat). |
| Kinetic energy | energy of motion |
| kinetic energy | increases as both mass and velocity increases |
| Examples of kinetic energy | a rock falling off a cliff and a person jumping into the pool from a diving board |
| potential energy | energy of position, stored energy |
| gravitational potential energy | depends on the height of an object and Example: standing at the top of a diving board |
| Elastic potential energy | is potential energy of an elastic object that is under tension or compression and Example: Pulling back a bow |
| Nonrenewable Energy Sources: | when an energy source can not be replaced in your lifetime it is considered nonrenewable |
| fossil fuels | the three major fossil fuels are oil, coal, and natural gas and the most plentiful fossil fuel in the United States is coal and the most plentiful fossil fuel in Arkansas is natural gas which produces the lowest levels of air pollutants |
| nuclear energy/ nuclear fission | splitting an atom's nuclear into two small nuclei and 1. water is changed into stem in a nuclear power plant from heat released from nuclear fission reactions |
| nuclear fusion: | combining two atomic nuclei to produce one larger nucleus. Nuclear Fission: Splitting atoms * Both produce heat or thermal energy |
| Renewable Energy Sources: | will never run out, it is sustainable |
| Energy Conservation | reducing energy use and Example: Choosing CFL bulbs over incandescent bulbs. |
| Energy Efficiency | is the percentage of energy that is actually used to perform work. |
| Types of Renewable Energy Sources | solar energy, wind energy, Hydroelectric power, Biomass, Geothermal Energy. |
| solar energy: | solar energy generates heat and electricity from the sun directly or using Photovoltaic cells |
| wind energy: | converts kinetic energy into electricity using windmills with large blades that require 11- 13 mile per hour winds on average to operate and generate electricity. This energy source is indirectly a form of solar energy, because without the sun we would no |
| Hydroelectric Power: | hydroeletric power creating dams in running water to capture the kinetic energy as it moves. 1. This is the most common renewable resource used today. |
| Biomass | is using waste products to produce energy. and biomass 1. Examples: wood, gasohol, biofuel, corn. |
| Geothermal Energy: | The intense heat from the Earth's interior that warms the magma beneath Earth's surface. geothermal energy |
Created by:
Hobbsb1
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