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ENERGY - PowerPoint PPT Presentation


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ENERGY. THE ABILITY TO DO WORK OR TRANSFER HEAT. WORK. THE ENERGY TRANSFERRED BY A FORCE TO MOVE AN OBJECT Measured in joules (J) Formula for Work: WORK = FORCE X DISTANCE. WORK. WORK IS DONE ON AN OBJECT WHEN AN OBJECT IS FORCED TO MOVE. Dodge.com. TYPES OF ENERGY. POTENTIAL

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energy
ENERGY
  • THE ABILITY TO DO WORK OR TRANSFER HEAT.
slide2
WORK
  • THE ENERGY TRANSFERRED BY A FORCE TO MOVE AN OBJECT
  • Measured in joules (J)

Formula for Work:

WORK = FORCE X DISTANCE

slide3
WORK
  • WORK IS

DONE ON AN OBJECT

WHEN AN OBJECT

IS FORCED TO MOVE

Dodge.com

types of energy
TYPES OF ENERGY
  • POTENTIAL
  • KINETIC

(both measured in joules)

potential energy
POTENTIAL ENERGY
  • STORED ENERGY
  • ENERGY AT REST
  • NOT DOING WORK OR TRANSFERRING HEAT
potential energy1
POTENTIAL ENERGY

gaspumpheaven.com

kinetic energy
KINETIC ENERGY
  • ENERGY IN MOTION
  • ENERGY IN USE
kinetic energy1
KINETIC ENERGY

Coloradorunner.com

FreeFoto.com

FreeFoto.com

forms of energy
FORMS OF ENERGY
  • CHEMICAL
  • ELECTRICAL
  • MECHANICAL
  • SOUND (Included in mechanical)
  • HEAT (THERMAL)
  • LIGHT (RADIANT)
  • NUCLEAR
chemical
CHEMICAL
  • The potential energy stored in chemical bonds that hold chemical compounds together
  • Released during chemical reactions

FreeFoto.com

electrical energy
ELECTRICAL ENERGY
  • The energy associated with moving electrical charges

(electrons)

FreeFoto.com

mechanical energy
MECHANICAL ENERGY
  • The energy associated with the motion or position of an object
  • Moving parts, muscles

FreeFoto.com

sound energy
SOUND ENERGY
  • The energy associated with sound. Think about the energy produced by a subwoffer that you can feel as vibrations.

FreeFoto.com

heat thermal energy
HEAT (THERMAL) ENERGY
  • The total energy of the particles in an object
  • Temperature of object
  • Boiling water > ice

FreeFoto.com

light radiant energy
LIGHT (RADIANT) ENERGY
  • The energy associated with waves of light

FreeFoto.com

FreeFoto.com

nuclear energy
NUCLEAR ENERGY
  • The potential energy associated with the nucleus of an atom
  • Fission - Splitting (Uranium)
  • Fusion - Combining (H->He)

http://iter.rma.ac.be/en/img/FusionReaction.jpg

first law of thermodynamics
FIRST LAW OF THERMODYNAMICS
  • Energy cannot be created nor destroyed, it can only change form.
  • Burn wood

Chemical energy changes into light and heat

  • Eat cheeseburger

Chemical energy changes into mechanical and heat

second law of thermodynamics
SECOND LAW OF THERMODYNAMICS
  • When energy is changed from one form to another, some energy is always lost as heat. 100% of energy cannot be converted into useful work
  • ENERGY CONVERSIONS ARE NOT 100% EFFICIENT.
food chain
FOOD CHAIN
  • 90% OF THE ENERGY IS LOST AS HEAT AT EACH STEP OF A FOOD CHAIN

http://lgfl.skoool.co.uk/uploadedImages/12.2_energy_food_chains.gif

entropy
ENTROPY
  • THE THERMODYNAMIC MEASURE OF DISORDER
  • A SYSTEM TENDS TO BECOME DISORDERLY
  • TO MAINTAIN ORDER ENERGY MUST BE USED
entropy1
ENTROPY

www.dodge.com

  • TO KEEP YOUR ROOM CLEAN YOU MUST USE ENERGY TO PICK UP AND ORGANIZE
  • TO MAINTAIN A CAR THE OIL MUST BE CHANGED, TUNE UPS, SPARK PLUGS REPLACED, FLUIDS TOPPED OFF OR REPLACED, ETC.
energy conversions
Energy Conversions
  • An energy conversion is a change from one form of energy to another.
  • In the picture on the next slide we see potential mechanical energy transforming into kinetic mechanical energy and heat and then vice versa
conversions involving chemical energy
Conversions Involving Chemical Energy
  • The chemical energy in the food you eat is converted into another kind of chemical energy your body can use (ATP).
  • Your body then converts that chemical energy into kinetic mechanical energy when you move.
conversions involving electricity
Conversions Involving Electricity
  • You encounter many electrical energy conversions in your day to day life.
  • What energy form is missing during each conversion?
where does the energy go
Where Does the Energy Go?
  • The 1st Law of Thermodynamics states that energy cannot be created or destroyed.
  • Energy can be converted from one form of energy to another, but all the different forms of energy in a closed system will always add up to the same amount of total energy.
no conversion without thermal energy
No Conversion Without Thermal Energy
  • Any time one form of energy is converted into another, some of the original energy always gets converted into thermal energy.
  • The thermal energy due to friction that results from energy conversions is usually not useful energy.
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