Unit 2 Test

Energy in Forms

Energy- ability to cause change

Kinetic Energy- Energy of an object that is due to motion

Potential Energy- Energy that an object has due to its position, condition, or chemical composition

Greater Mass- Greater Kinetic Energy

Mechanical Energy- sum of an objects kinetic energy and potential energy

Kinetic Energy

Sound energy- energy caused by vibration of particles in a medium such as steel, water, or air

Electromagnetic Energy- energy transmitted through space in a form of electromagnetic waves

Electrical Energy- results from position or motion of charged particles

Chemical Energy- form of potential energy; amount of chemical energy in a molecule depends on the kinds of atoms and their arrangement; sources of chemical energy are your food you eat

Thermal Energy- object is the kinetic energy of its particles; Higher temp, particles move faster

Nuclear Energy- source of nuclear energy is nucleus of atom

Energy Transformation- takes place when energy changes from one form to another form

Law of Conservation of Energy- energy cannot be created nor destroyed but con only change forms

Mass increases, Kinetic Energy increases

Heat is always transferred from a higher temp to a lower temp

Kinetic Theory of Matter- all particles that make up matter are constantly in motion

Solid- not free to move around;vibrate back and forth in same position and are held tightly together

Liquid- Move more freely than solid but not as much as gas; constantly sliding around

Gas- lost of space to move around; collide with one another

Temperature- measure of the average kinetic energy of all the particles in an object

Kelvin Scale- commonly used by physicists; Freezes= 273 K Boils= 373 K

Fahrenheit Scale- Commonly used in U.S.; Freezes= 32 F; Boils= 212 F

Thermometer- temperature is measured by this

Degrees- equally spaced units between two points

Absolute Zero- motion of particles stop

Celsius Scale- commonly used around the world; Water Freeze=0 C; Boils=100 C

Thermal Energy- total kinetic energy of all particles in a substance

Water with higher temp= more thermal energy

Average Kinetic energy decreases, than temp decreases

Heat is measured 2 ways; Calorie; amount of energy needed to raise the temp of 1 gram of water by 1 degree Celsius and Joules

Heat- Energy transfers from an object with a higher temp to an object with a lower temp

Conduction- transfer of energy as heat from one substance to another trough direct contact

Insulator- material that is a poor conductor of heat

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Convection- transfer of energy as heat by the movement of a liquid or a gas

Radiation- transfer of energy by electromagnetic waves

Renewable Resource- energy source that can be easily reproduced or replaced by nature

Heat always flows from hot to cold

Nonrenewable Source- energy source that can not be produced, grown, or restored as fast as it is used

Sun is earths main energy source

Fossil Fuels- energy resources made from carbon-rich plant and animal remains

Coal- formed from remains of dead plants; nonrenewable

Natural Gas- gases that become trapped in rock formations, half of U.S. uses natural gas to heat home; produces carbon dioxide

Petroleum- "rock oil"; mined on land or in ocean; separated into fossil fuels such as gasoline, diesel, and jet fuel

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Solar energy- renewable; converted into electrical energy

Nuclear Energy- nonrenewable; harmful radioactive wastes

Hydroelectric Energy- renewable; powered by water cycle; can only be produced by large amounts of water

Wind Energy- renewable; depends on steady strong wind

Geothermal Energy- extracted from heat stored within the Earth; Renewable

Energy from burning Biomass- renewable; recently dead organic material that can be used as fuel; burning them releases carbon dioxide