Energy

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Energy
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Definition? From Wikipedia

• In physics, energy (from the Greek ?????e?a -
  energeia, "activity, operation",) is a scalar
  physical quantity that describes the amount of
  work that can be performed by a force.

http//en.wikipedia.org/wiki/Energy
What does scalar mean? without direction.
What is work? The force required to move an
object multiplied by the distance it is moved.
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Different forms of energy include

• kinetic,
• potential,
• thermal,
• gravitational,
• sound,
• light,
• elastic,
• Electromagnetic,
• Chemical energy,
• Nuclear energy.
• The forms of energy are often named after a
  related force.

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Kinetic Energy

• The energy of movement.

http//digital-photography-school.com/wp-content/u
ploads/2007/08/movement-blur-1.jpg
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Potential energyThe stored energy of position.
http//www.solarpowerwindenergy.org/wp-content/upl
oads/2009/05/kineticandpotentialenergy.jpg
http//www.greenscreen.org/articles_sr/energy/imag
es_potential_kinetic_energy/potential_kinetic.jpg
http//www.physicsclassroom.com/Class/energy/u5l1b
1.gif
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Thermal / Heat energy
http//www.physast.uga.edu/rls/1020/ch4/fig4-4.jp
g
This is the energy in the molecules of a
substance which move. More thermal energy means
more molecule movement so it is really Kinetic
energy on a molecular scale!
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Gravitational Energy

• This is a type of energy that an object has
  because of its mass. The bigger an objects mass
  the greater its gravity.

http//www.phys.unsw.edu.au/cgt/cgt/Honours_Proje
cts_files/shapeimage_2.jpg
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Sound energy

• The energy carried in waves in the air.

http//www.gobates.com/HM00050_.gif
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Light energy.

• The energy carried in light waves. Nearly all
  life on this planet depends on this as its
  original energy source.

http//farm1.static.flickr.com/75/227649503_88121c
f734.jpg
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Electrical energy

• The energy carried by moving charges.

http//universalgeneral.com/db4/00336/universalgen
eral.com/_uimages/41k_CloudLightening.jpg
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Elastic energy

• A type of potential energy.

http//www.bbc.co.uk/schools/gcsebitesize/science/
images/energy_elastic.jpg
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Electromagnetic energy

• Energy carried by electromagnetic waves. Light
  energy is one type of these energies.

http//www.nasa.gov/centers/langley/images/content
/114284main_EM_Spectrum500.jpgimgrefurlhttp//ww
w.nasa.gov/centers/langley/science/FIRST_prt.htmu
sg__VVUKc2-ReBx_iG9MsP9R6VXr_7sh317w500sz6
7hlenstart6um1tbnid6VN-zkKvE-3H3Mtbnh82
tbnw130prev/images3Fq3Delectromagnetic2Bene
rgy26ndsp3D1826hl3Den26lr3D26um3D1
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Chemical energy

• The energy found in the bonds between atoms.

http//www.chemistry.wustl.edu/courses/genchem/La
bTutorials/Cytochromes/images/flowchart1.jpg
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Nuclear energy

• The energy found within an atom.

http//library.thinkquest.org/06aug/01200/Graphics
/705px-Nuclear_fireball.jpg
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Law of Conservation of energy

• Energy cannot be created or destroyed, it can
  just change from one type to another.

• An energy changer is called a TRANSDUCER

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How does this apply to living things?
http//en.wikipedia.org/wiki/FileEnergy_and_life.
png
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Think of a car. What energy changes take place
in a car?
http//www.foothill.edu/sustainability/smart-car.j
pg

• What about this one?

http//www.speedace.info/solar_cars/solar_car_imag
es/auburn_university_solar_car_banked_road_test.jp
g