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Biomechanics and Energy Dustyn Roberts 3 / 5 /201 3

Biomechanics and Energy Dustyn Roberts 3 / 5 /201 3. Energy = capacity to do work Positive and negative Types of energy: Electrical Thermal Chemical Sound Electromagnetic Potential Kinetic Units of Energy: Joules (J) = Nm. Power is the rate that energy is expended

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Biomechanics and Energy Dustyn Roberts 3 / 5 /201 3

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  1. Biomechanics and Energy Dustyn Roberts 3/5/2013

  2. Energy = capacity to do work • Positive and negative • Types of energy: • Electrical • Thermal • Chemical • Sound • Electromagnetic • Potential • Kinetic • Units of Energy: Joules (J) = Nm

  3. Power is the rate that energy is expended Units of Power = Watts (W)

  4. Volunteer to hold a book...

  5. Energy conversion/efficiency Muscles ~25% Electric motors ~80% Note: there are no perpetual motion machines

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