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## Homework Statement

The ﬁgure below shows a graph of potential

energy versus interatomic distance for a particular molecule. Rank the magnitude of the

force at locations A, B, and C. (That is, which

is the greatest, which is smallest, and are any

of these equal to each other?)

http://img851.imageshack.us/img851/5526/captureyrd.png [Broken]

Uploaded with ImageShack.us

## Homework Equations

F = -dU/dx ?

## The Attempt at a Solution

To be honest I really have no idea on this one :/. I thought I could find the force using the change of potential energy corresponding with change in interatomic distance but that does not give me the right answer.

It would seem more logical to calculate force based on R itself. Since it's interatomic, I assume force increased with decreasing R, but again that was wrong.

Any ideas?

EDIT: Never mind. I realized my mistake and I did not read the "magnitude" word in the question. I figured out the right answer so this thread is no longer needed

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