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ENERGY

ENERGY. Question : Which would hurt more… Falling off your chair, or falling off of the roof…?. Ouch… So the same mass has more energy depending on how far it moves (distance). Question : Which would hurt more… Getting hit with a ping pong ball or a bowling ball moving at 30 mph?.

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ENERGY

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  1. ENERGY

  2. Question: Which would hurt more… Falling off your chair, or falling off of the roof…?

  3. Ouch… So the same mass has more energy depending on how far it moves (distance).

  4. Question: Which would hurt more… Getting hit with a ping pong ball or a bowling ball moving at 30 mph?

  5. Ouch… So a different mass has more energy depending on how fast it moves (force).

  6. Energy & Work • ENERGY is the ability to cause change, or do work. • WORKis the transfer of energy through motion. In order for work to happen, a force must be exerted over a distance. • W = (force) x (distance)

  7. In order to understand energy, we need to understand work. • amount of work depends on how much force, and how much distance. The force is the same; the distance is greater, so there’s more work. BOOK

  8. What’s another example of work? Share your 3 examples from yesterday’s assignment.

  9. Now, let’s talk about ENERGY....

  10. 2 Types of Energy • There are two types of energy: Potential & Kinetic. * Potential = Stored * Kinetic = Movement

  11. VOCABULARY • Potential: storedenergy: ‘hanging out’ • Kinetic: movementenergy: ‘happening’ • Energy: the ability to cause change. • Work: the transfer of energy through motion.

  12. Understanding Check • Why do these people have potential energy?

  13. Understanding Check • How do you know he has kineticenergy?

  14. 2 TYPES • Kinetic: The ‘Happening Energy’…Motion • Potential: The ‘Hanging Out Energy’…Stored

  15. POTENTIAL ENERGY • Things have energy depending on where they are. The penny has LOTS of potential energy; the building, rock, and flowers don’t. penny flowers rock Empire State Building

  16. POTENTIAL ENERGY • Gravitational (the falling rock) • There are many types of potential energy. • Chemical (food)

  17. FORMS OF POTENTIAL ENERGY • Chemical (food, gasoline) • Nuclear (fusion & fission) • Gravitational (position or place) • Stored Mechanical (stretched rubber band)

  18. EXAMPLES OF POTENTIAL ENERGY Food Nuclear Stored Mechanical Height

  19. KINETIC ENERGY • Remember, it’s the energy of movement. • Lots of things move!

  20. KINETIC ENERGY Things have energy depending on how big they are and how fast and far they move. Which has more kinetic energy?

  21. KINETIC ENERGY • Sound • Travels in waves, JUST LIKE IN THE OCEAN • Has to have something to travel through. Energy traveling through AIR

  22. KINETIC ENERGY • Radiant, light • Also travels in waves • DOESN’T need anything to travel through Earth Sun Energy traveling through SPACE

  23. KINETIC ENERGY • Electrical • When electrons move. Don’t worry about what an electron is just yet! Just remember: lightning and electricity are kinetic energy.

  24. EXAMPLES OF KINETIC ENERGY Dancing Sound Light Electricity

  25. Law of Conservation of Energy • No, this doesn’t mean ‘Turn the lights out!’ • It means: “Energy may change form but it can neither be created nor destroyed under ordinary circumstances.”

  26. Law of Conservation of Energy • Energy can change from potential to kinetic, and then back to potential again. • You can’t ever makeMORE of it and you can’t destroyit… …you can just change the way it looks, how it is stored, where it goes, or how it is transferred.

  27. Law of Conservation of Energy • This simply means that if one object is losing energy, something else must be gaining energy… • The converse is; if an object is gaining energy, something else is losing it.

  28. Law of Conservation of Energy An example would be a hammer hitting a nail… Potential energy in the hammer, kinetic energy swinging the hammer… …then the energy is transferred to the nail in form of movement into a piece of wood.

  29. Law of Conservation of Energy An example would be a hammer hitting a nail… The hammer doesn’t have much potential energy anymore since it is down. It would take some kinetic energy to lift it back up, so that it would again have potential energy to swing back down.

  30. Conservation of Energy • This means that kinetic energy can turn into potential energy which can turn into kinetic energywhich can turn into potential energy which can turn into kinetic energywhich can turn into potential energy which can turn into kinetic energy which can turn into potential energy…….. Kinetic Potential

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