02-08-08 - Potential Energy

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Transcript

  • 1. Unit 8 (Chapter 10 & 11) Potential Energy
  • 2. Energy
    • Energy is defined as the ability to do work
      • 6 Types of energy
        • Kinetic Energy: associated with motion
        • Heat: associated with the speed of internal particles
        • Chemical: bonds atoms together
        • Electromagnetic: moving electric charges
        • Nuclear: in the atomic nucleus
        • Potential Energy: energy of position (energy at rest)
  • 3. Energy
    • The units of energy are joules
    • joules are also the same unit as work!
    • (How Confusing!)
    • You can think of energy as stored work – that is ready to be released!
    • Energy cannot be created or destroyed – only changed from one type of energy to another!
  • 4. Potential Energy
    • Is energy stored in an object
    • due to its position
    • Potential Energy is also
    • considered energy at rest
    • GPE = mass x acceleration due to gravity x height
    Potential Energy Potential Energy (joules) m - mass of object in kg g - acceleration of gravity in m/s 2 h - height of object, in m GPE – gravitational potential energy in J GPE = mgh
  • 5. Potential Energy
    • Gravitational potential energy depends on an objects mass and height
    • Objects with potential energy don’t use their energy until they start moving.
    • The further the object is from the ground the more potential energy it has
    • Chemical potential energy is energy stored in the form of chemical bonds.
  • 6. Law of Conservation of Energy
    • Energy can never be created or destroyed just turned into another form.
  • 7. Law of Conservation of Energy
    • When a ball flies through the air it does not lose energy even though it slows down and speeds up
    • The energy in the ball changes from kinetic to potential and then back to kinetic energy