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Kinetic &  Potential  Energy
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Kinetic & Potential Energy

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  • 1. Kinetic & Potential Energy December 8th, 2008
  • 2. Kinetic Energy
    • Energy of an object due to its motion
    • Depends on speed and mass
    • KE = 1/2 mv 2
      • So what would hurt more, a bigger car, or a faster car?
    • Units?
      • Mass (kg)
      • Velocity (m/s)
      • Kg * m/s * m/s = (kg*m 2) / (s 2 ) = N * m = J!!
  • 3. Work-Kinetic Energy Theorem
    • Net work done by an object is equal to the CHANGE in kinetic energy of the object
    • W = ∆KE
  • 4. Potential Energy
    • Energy associated with an object due to the position of an object
    • Gravitational Potential Energy
      • Potential energy associated with an object due to the position of an object relative to the Earth
      • PE= mgh
        • M = mass
        • G= acceleration due to gravity
        • H = height
  • 5. Conservation of Energy
    • Energy is neither created or destroyed
      • Where have you heard this before???
      • Sum of all energies in a system is constant
    • Mechanical Energy
      • Sum of kinetic energy and all forms of potential energy
        • ME = PE + KE
      • Can change forms, but total amount is constant