1 / 15


Energy. What is Energy ?. The ability to do work or cause a change. When an object or living thing does work on another object , some of its energy has been transferred . Energy is measured in joules, the same units as work .

Télécharger la présentation


An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.


Presentation Transcript

  1. Energy

  2. WhatisEnergy? • The ability to do work or cause a change. • When an object or living thingdoeswork on anotherobject, some of itsenergy has been transferred. • Energyismeasured in joules, the sameunitsas work. • Power is the rate atwhichenergyistransferred. • Power= energytransferred/time

  3. KineticEnergy • Kineticcomesfrom the greekwordkinetos, whichmeans to move • Kineticenergyis the energy an object has due to its motion. • There are 2 factorsthat affect kineticenergy: • Mass • Velocity • Think about a golf ball and a bowling ball

  4. PotentialEnergy • Is energythat has the potential to do work. • Gravitationalpotentialenergyisrelated to the object’sheight. • The higher the object or the more weight an object has, the greater the gravitationalpotentialenergy • Elasticpotentialenergyisassociatedwithobjectsthatcanbestretched or compressed.

  5. Forms of Energy • Mechanicalenergyisassociatedwith the position and motion of an object. • = potentialenergy + kineticenergy

  6. Thermal Energy • Is the total potential and kineticenergy of the particles in an object. • Ex. icecream, lava

  7. ElectricalEnergy • The energy of electrical charges • Depending on whether the charge ismoving or storeddetermineswhether or not itispotential or kineticenergy.

  8. ChemicalEnergy • Is potentialenergystored in the chemical bonds thatholdchemical compounds together. • Almosteverythingyousee, touch, or taste iscomposed of chemical compounds. • Whenchemical compounds are broken, new compounds mayform, releasing energy.

  9. NuclearEnergy • Is stored in the nucleus of atoms • Is releasedwhenduring a nuclearreaction • Fission-nucleus splits • Fusion-nucleifuse • Continuously happening in the sun, releasing tremedousamounts of energy

  10. ElectromagneticEnergy • Is the energy of light and otherforms of radiation • The sunlight weseeeachdayiselectromagneticenergy • It travels in waves-x rays, uv rays, radio wavesand microwaves

  11. Energy Transformations • Are a change from one form of energy to another • Single tranformation • Toastingbread • Electrical to thermal • Cell phone • Electricalto electromagnetic • Your body • Chemical to mechanical

  12. Energy Transformations • Multiple transformations- often a series of energy transformations isneeded to do work • Ex- lighting a match • Thermal to chemical to thermal to electromagnetic

  13. Energy Transformations • One of the mostcommonforms of energy transformation itbetweenpotential and kinetic • Ex. juggling, pendulum, pole vault

  14. Conservation of Energy • The lawof conservation of energy states thatenergycannotbecreated or destroyed • So whydoes a top stop spining? • Friction= mechanical to thermal

  15. Energy and Fossil Fuels • Plants of ancientforestsprovide the energystored in fossil fuels • Coal, petroleum and naturalgas are fossil fuels • Wheredidfossil fuels gettheirenergy? • The SUN • Fossil fuels canbeburned to release thatenergy, thisisknown as combustion

More Related