Potential energy and kinetic energy

  • #1
itachipower
10
0
So today in class we were talking about gravity and my professor said that generally KE = -.5PE
And so TME = .5PE

I don't understand how that works.
 

Answers and Replies

  • #2
hilbert2
Science Advisor
Insights Author
Gold Member
1,562
579
That's the virial theorem, and it holds in that form for interacting masses whose potential energy is proportional to the inverse of their separation (e.g. gravitational interaction). Note that the kinetic energy and potential energy appearing in that equation are averages over time.

http://en.wikipedia.org/wiki/Virial_theorem
 
  • #3
itachipower
10
0
Oh okay! Thanks!
 

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