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Re: Orbital Kinetic Energy

Your proposition is not true for any and all circular orbits.
It is true for the circular orbit maintained by an inverse square central
force (eg: gravitation). This force law must be invoked, in some fashion
(eg, through the potential), to prove the proposition.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
----- Original Message -----
From: "Brian Blais" <bblais@BRYANT.EDU>
To: <>
Sent: Monday, February 02, 2004 8:04 PM
Subject: Orbital Kinetic Energy


I was wondering if anyone knew of a calculation showing that the kinetic
energy of an object in a circular orbit is equal to half of the potential
energy, where the calculation does *not* use acceleration or force at all.
there an argument for this based purely on energy concepts? It occurred
to me
that there should be, but I can't think of it.


Brian Blais