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Kinetic &  Potential  Energy
 

Kinetic & Potential Energy

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    Kinetic &  Potential  Energy Kinetic & Potential Energy Presentation Transcript

    • Kinetic & Potential Energy December 8th, 2008
    • 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!!
    • Work-Kinetic Energy Theorem
      • Net work done by an object is equal to the CHANGE in kinetic energy of the object
      • W = ∆KE
    • 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
    • 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