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*From*: Bob Sciamanda <trebor@VELOCITY.NET>*Date*: Mon, 2 Feb 2004 21:12:43 -0500

Brian,

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)

http://www.velocity.net/~trebor

trebor@velocity.net

----- Original Message -----

From: "Brian Blais" <bblais@BRYANT.EDU>

To: <PHYS-L@lists.nau.edu>

Sent: Monday, February 02, 2004 8:04 PM

Subject: Orbital Kinetic Energy

Hello,Is

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 occurredto me

that there should be, but I can't think of it.

thanks,

Brian Blais

-----------------

bblais@bryant.edu

web.bryant.edu/~bblais

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