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Ppt Energy

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Transcript

  • 1. ENERGY
  • 2. Energy
    • Everything in the universe can be classified as either matter or energy.
    • Matter is anything that has mass and takes up space.
    • Energy is everything else like……
  • 3. Energy
    • Kinetic energy
    • Potential energy
    • Electricity
    • Nuclear energy
    • Light
    • Sound
    • Chemical
    • Thermal (heat)
  • 4. Energy
    • Energy is…
      • The ability to cause change
      • The ability to do work.
  • 5. Energy
    • The unit for energy is the joule.
    • 1 joule = 1 kg- m 2 /s 2
  • 6. Kinetic Energy
    • Kinetic energy (KE) is energy in the form of motion.
    • The amount of kinetic energy an object has depends on its ___________ and _________ .
    • KE = ½ mv 2
  • 7. Kinetic Energy
    • Which has more kinetic energy?
      • A bus traveling at 65 mph
      • A car traveling at 65 mph
    • Which has more kinetic energy?
      • A bus traveling at 65 mph
      • A bus traveling at 40 mph
  • 8. Potential Energy
    • Potential energy is ___________ energy.
    • The amount of potential energy depends on its ____________ or ___________.
    • Potential energy due to the object’s height above the earth’s surface is called ______________ .
  • 9. Gravitational Potential Energy
    • The formula for gravitational potential energy is…
    • GPE = mgh
  • 10. Gravitational Potential Energy
    • Which has more GPE?
      • A boy sitting in a tree 12’ above the ground
      • A squirrel sitting in a tree 12’ above the ground.
    • Which has more GPE?
      • A squirrel sitting 12’ above the ground
      • A squirrel sitting 30’ above the ground.
  • 11. The Law of Conservation of Energy
    • Energy cannot be created or destroyed only transformed from one form into another.
  • 12. WORK
    • The scientific definition of work is ….
    • Work, like energy, is measured in ________
    • The formula for work is…
    • W = F x D
  • 13. WORK
    • Two factors must be considered when deciding if work is being done
    • Does the object move?
    • What is the actual force applied?
  • 14. He may expend energy when he pushes on the wall, but if it doesn’t move, NO WORK is performed on the wall!!!
  • 15. WORK
    • In which case, would more work be done?
    • Lifting 1 book over your head or lifting 2 books over your head.
    • Holding 2 books at shoulder level or lifting 2 books over your head.
    • Holding a stack of books and walking them to the table or pushing a stack of books over the table.

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