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Vertical energy of a pendulum - is there one?

  1. Jan 8, 2015 #1
    1. The problem statement, all variables and given/known data
    Hello. I was just wondering. You have a simple pendulum . string and a ball with mass at the end. We usually solve examples and we think about conversation of kinetic energy and potentional energy. I was just wandering if there is also something like vertical kinetic energy. Or it is just a part of kinetic energy itself (just the sine part of velocity vector). If it exist, i know it is very small. I was just wondering... Thank you.

    2. Relevant equations
    no need for them

    3. The attempt at a solution
    thinking
     
  2. jcsd
  3. Jan 8, 2015 #2

    Doc Al

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    Staff: Mentor

    Not quite sure what you mean. You can certainly express the velocity of the pendulum in terms of vertical and horizontal components, but the kinetic energy uses the full velocity. Velocity has a direction, but kinetic energy does not.
     
  4. Jan 8, 2015 #3
    It is totaly clear now. Thank you.
     
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