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Energy 2

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0/14 Steps
  1. Technical
    Potential well
  2. Mathematical
    Stationary points
  3. Technical
    Equilibrium & stability
    1 Task
  4. Work
  5. Mathematical
    Dot-product
  6. Technical
    Heat & conservative forces
    1 Task
  7. Energy conservation (1st law of thermodynamics)
    2 Tasks
  8. Mathematical
    Sign conventions
  9. Technical
    Energy conservation vs momentum conservation
    1 Task
  10. Work-energy theorem
  11. Energy in rolling
  12. Philosophical
    The human body "machine"
    1 Task
  13. Technical
    Power
  14. Ending
    Summary of the Energy discipline

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Energy 2 Work-energy theorem
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Skill 10 of 14
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Work-energy theorem

In every-day life we often have not too many types of energies involved.

  • Let go of a basketball, and gravity does work on it so it speeds up (and this work converts stored potential energy to kinetic).
  • Push on your friend on a bike to help him gain speed, and your pushing force does work on him in order to give him kinetic energy.
  • A spacecraft in space pushes forwards with its rocket engines, and this pushing force does work which speeds up the craft.

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References:

  1. ‘Conservation of Energy. Readings on the Origins of the First Law of Thermodynamics. Part I’ (article), Jaime Wisniak, Scielo, Educación Química: Para Quitarle el Polvo, vol. 19, issue 2, 2008, www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0187-893X2008000200013 (accessed Jun. 24th, 2020)
  2. ‘Sears and Zemansky’s Univesity Physics with Modern Physics’ (book), Hugh D. Young & Roger A. Freedman, Pearson Education, 13th ed., 2012

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