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Force from a Kinetic Energy Function

by Dustinc
Tags: energy, force, function, kinetic
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Dustinc
#1
Oct23-13, 01:15 PM
P: 3
Say you're given a function that represents the kinetic energy of some object, what would you have to do to derive the force from that function? I know that for motion along a straight line a conservative force F(x) is the negative derivative of its associated potential energy function U, but what is there to do if the function is one of kinetic energy?
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Simon Bridge
#2
Oct23-13, 07:11 PM
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Conservation of energy and the work-energy relation will be useful in such cases.
You usually will need more information than kinetic energy with position alone.
Do you have an example.

Note: For a conservative field, the force on an object at a position is the negative gradient of the potential energy function at that position. Motion does not have to be along a straight line.
nasu
#3
Oct23-13, 08:58 PM
P: 1,969
You posted this same thing in the homework section.
I mean the OP, of course.

Simon Bridge
#4
Oct23-13, 09:03 PM
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Force from a Kinetic Energy Function

http://www.physicsforums.com/showthread.php?t=718422
nasu
#5
Oct23-13, 09:23 PM
P: 1,969
Ok, now we have an infinite loop.
I can go forever between the two threads, by using your links.


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