Force & Potential Energy Video Lessons

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Problem: The potential energy between two neutral atoms is called the Lennard-Jones potential, and is given by the equation U(x) = A/r12 - B/r6 where A and B are positive constants.  a) What is the force due to this potential energy? b) For what range of r is the force attractive, and for what range of r is the force repulsive? Note that if the force is positive, it is repulsive, and if the force is negative, it is attractive.

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Problem Details

The potential energy between two neutral atoms is called the Lennard-Jones potential, and is given by the equation

U(x) = A/r12 - B/r6

where A and B are positive constants. 

a) What is the force due to this potential energy?

b) For what range of r is the force attractive, and for what range of r is the force repulsive? Note that if the force is positive, it is repulsive, and if the force is negative, it is attractive.

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Based on our data, we think this problem is relevant for Professor Cardenas' class at UIW.