Perpetual Motion

  • Thread starter justjoshus
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  • #1

Main Question or Discussion Point

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
 
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Answers and Replies

  • #2
Doc Al
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Do a search on "Newton's Cradle" or "Newton's Balls".
 
  • #3
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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.
 
  • #4
alxm
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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?
 
  • #5
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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.
 
  • #6
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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.
Which generates heat and sound (which dissipates as heat).
 
  • #7
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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