Perpetual Motion

  1. What do you call and where can i buy the set of balls (maybe 4 or 5) suspended in strings and when the outermost ball hits the the next one and bounces off the last one on the other end and sets off perpetual motion? I surely appreciate any ones response. Thank you. Josh
    Last edited by a moderator: Jul 7, 2010
  2. jcsd
  3. Doc Al

    Staff: Mentor

    Do a search on "Newton's Cradle" or "Newton's Balls".
  4. Dadface

    Dadface 2,069
    Gold Member

    Hello justjoshus.You are describing "Newtons cradle" so try googling for suppliers.There is no such thing as perpetual motion and the balls in Newtons cradle stop eventually.
  5. alxm

    alxm 1,864
    Science Advisor

    I wonder how long it'd go on in a vacuum. I'm guessing air resistance is by far the biggest source of losses.
    I'm guessing it'd go on for a surprising amount of time. Anyone got a high vacuum to try it out in?
  6. Dadface

    Dadface 2,069
    Gold Member

    It would go on for longer in a vacuum but another major source of energy loss is due to the fact that during impact the balls get slightly distorted.
  7. Which generates heat and sound (which dissipates as heat).
  8. if magnets are involved in any mechanism of motion but it kept the motion consistant from other variables is it still considered perpetual motion??
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