ENERGY Above and beyond PE & KE THE LAW: CONSERVATION OF ENERGY ∑ E1 =∑E2 Energy cannot be created or destroyed; it only changes form Energy in = energy.

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Presentation transcript:

ENERGY Above and beyond PE & KE

THE LAW: CONSERVATION OF ENERGY ∑ E1 =∑E2 Energy cannot be created or destroyed; it only changes form Energy in = energy out Heat, light and sound are common forms of energy transfer

Many types of Energy Mechanical (PE & KE) Gravitational Kinetic Chemical Nuclear Electromagnetic Thermal

Mechanical Energy A object that is able to do work has mechanical energy Examples: Cars, trains, tractors, hammers, etc

Kinetic Energy (KE) The energy of motion KE=1/2mv 2 Expressed as Joules (J) Example: Book falling from shelf

Potential Energy (PE) Stored energy “The energy of position in a force field” PE=mgh Example: Book on a shelf aka: gravitational energy

Thermal Energy When the amount of heat added to a system and something happens to the system, Thermal Energy is to blame Expressed as ΔQ Example: Heat added to water activates the water molecules, increasing the KE of the system

Chemical Energy When certain chemicals combine, energy is released Most important source of energy right now Example: Combustion of glucose (sugar) in our bodies C 6 H 12 O 6 +6O 2 6CO 2 + 6H 2 O kcal/mole

Electromagnetic Energy Waves transporting energy from one point to another Rapid variation of electric and magnetic field Examples: radio waves, microwaves, infrared radiation, visible light, ultraviolet, x-rays, gamma rays, etc

Electrical energy Energy due to the separation of charges Example: electricity!

Nuclear Energy aka mass energy E= mc 2 Einstein first observed that anything with mass has energy Unstable isotopes can be fused or split thus liberating the energy within Examples: Fission & fusion

Nuclear Energy (cont’d) An incredibly small amount of mass has an incredibly large amount of energy Energy=mass x speed of light squared Speed of light = 3 x 10 8 m/s 50 grams of mass has potential to level an entire city

Elastic/Spring PE m/physicszone/lessonch/05work/ spring/speng.htmhttp:// m/physicszone/lessonch/05work/ spring/speng.htm

PROBLEMS: _of_Physics/07_Work,%20Energy %20and%20Power/06/sp.htmlhttp:// :26300/Principles _of_Physics/07_Work,%20Energy %20and%20Power/06/sp.html

_of_Physics/07_Work,%20Energy %20and%20Power/07/sp.htmlhttp:// :26300/Principles _of_Physics/07_Work,%20Energy %20and%20Power/07/sp.html

_of_Physics/07_Work,%20Energy %20and%20Power/09/sp.htmlhttp:// :26300/Principles _of_Physics/07_Work,%20Energy %20and%20Power/09/sp.html

From Chemical to Mechanical Dry Ice Bomb

Electromagnetic to Chemical Photosynthesis

Electromagnetic to Mechanical Motor

Electromagnetic to Thermal Heater

Chemical to Electromagnetic: Battery

Mechanical to Electromagnetic Generator Windmill

Mechanical to Chemical Metabolizing food

Mechanical to Gravitational Projectile Motion

Mechanical to Thermal Friction

Gravitational to Electromagnetic Dam

Gravitational to Thermal Compression

Chemical to Thermal Combustion: refers to the rapid oxidation of fuel accompanied by the production of heat, or heat and light

Thermal to Mechanical Turbine

Thermal to Gravitational Temperature gradient: atmospheric and oceanic currents

Nuclear to Thermal Nuclear reactor

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