1 / 19

Energy….

Energy…. Takes energy to work doesn’t it?. So… What is energy?. Energy: the ability to do work. Does NOT mean you will do the work It means you have the potential to do the work… Just because you have the energy to clean the garage (work) doesn’t mean you will do the work yarp.

cwen
Télécharger la présentation

Energy….

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.

E N D

Presentation Transcript

  1. Energy…. Takes energy to work doesn’t it?

  2. So… What is energy? • Energy: the ability to do work. • Does NOT mean you will do the work • It means you have the potential to do the work… • Just because you have the energy to clean the garage (work) doesn’t mean you will do the work • yarp

  3. Categories of energy • Kinetic energy (KE) = used energy… energy of motion • Running, moving, actually doing work • Potential energy (PE)= stored energy… energy of position • Unused batteries, squished spring, holding a book in the air • yarp

  4. Math… aw yea!!!! • KE = ½ mv2 m = mass V = velocity • PE = mgh m = mass G = 9.8 m/sec2 (gravity) H = height m • Units of both = Joules (same as work) • yarp

  5. Try em out!!!! • A 2 kg ball is moving at a velocity of 5 m/sec north. How much kinetic energy? • You hold a 2 kg ball 2 meters high. How much potential energy?

  6. Your sweet coaster data

  7. More sweet graph data

  8. Energy is either being stored or used • You have a new battery potential energy • You plug in the battery and use it… kinetic energy • Whenever energy is changing/moving it is always going to be either: • Kinetic or potential energy • Changing from one to the other • yarp

  9. examples • Slinky spring • Pushing a boulder up a hill • Letting the boulder fall down the hill • Wait a sec… yep, our coaster data showed this!!!! • yarp

  10. Woa… enough notes for now!!! • Time to do a curvy cpo coaster lab!!!! • Aw yea!!! Lab lablab… • Sweet sweetsweet!!!!! • Lab lablab!!! • Yarpyarpyarp

  11. Energy changes and types pt 2

  12. Make sure you talked about… • About the marble roller coaster lab first… • Don’t be naughty and skippy poo this!!!! • Show the graphs… talk about energy… love it…. • yarp

  13. Energy types… just like force types • 1 Physical/mechanical: energy of motion • using energy to physically move things • 2 Radiant energy: light, radio, U.V. visible electromagnetic waves • 3 Electricity: electrical energy • Could be radiant… • 4 Heat/thermo: heat… always present • Heat: energy moving from warmer to colder things • Could also be radiant • yarp

  14. More??? More… • 5 Chemical: energy of chemical reactions • Energy of the making and breaking of chemical bonds • Energy in gasoline, your food, putting a metal in acid. • 6 Nuclear: energy within the nucleus of an atom. (matter converted into energy) • Fusion = combining nucleuses • Sun does this… hydrogen nuclear reactions • Fission = splitting of splitting of nucleuses • Uranium, plutonium bombs • yarp

  15. More???? Last one… • 7 Sound: the energy of sound waves. • Sound is the vibration of particles at certain frequencies picked up by your ear. • You can not hear in space/vacuum. • Can be considered physical because the particles are physically moving. • Yarpy!

  16. Deserve to conserve • Conservation of energy: energy is not gained or lost… only converted into different forms. • Energy conversions are inefficient. • During every energy conversion heat is produced • Yarp…

  17. Example time… • Playing a blu ray dvd through your HDTV • Draw it out!!!! Shout it out… yarp it out!!! • Or… if short on time… skip this and move on to the last 2

  18. Example 2… yea! • The starting of a car…. Old skoolcoolio!!!!

  19. Example 3… • Using a photovoltaic cell (solar power) to power a fan that has a looped rope tied to it spinning an electrical generator to power a radio.

More Related