Understanding Additive Pair Potential in Molecular Dynamics

  • Thread starter Thread starter calif2a8
  • Start date Start date
  • Tags Tags
    Pair Potential
AI Thread Summary
Additive pair potential in molecular dynamics refers to the total potential energy of a system being the sum of the potential energies of individual pairs of particles. This approach simplifies calculations, as it assumes interactions between pairs without considering the influence of other particles. However, in cases where the energy between two particles is affected by the presence of a third particle, the potential becomes more complex and cannot be treated as merely a pair potential. The additive pair potential is a common assumption in molecular dynamics simulations for efficiency. Understanding this concept is crucial for accurately modeling interactions in multi-particle systems.
calif2a8
Messages
3
Reaction score
0
I'm sorry, I wasn't exactly sure where to put this question but this section is probably my best bet. I'm basically trying to understand potential functions of more than 1 parameter... which is basically, most potential functions out there for molecular dynamics, what I just started working with. What is an "additive pair potential"? I can't seem to piece it together :rolleyes:
 
Physics news on Phys.org
It means that the total potential energy of the system is the sum over all potential energies of pairs of particles in the system. It does not, in general, have to be the case. For example: if the energy between two particles depend on whether there is a third particle nearby than the potential energy is much more complicated than the pair potential. Usually we assume pair potential for simplicity.
 

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
View full post »

Thread 'Average velocity as a weighted mean'

Hello everyone, Consider the problem in which a car is told to travel at 30 km/h for L kilometers and then at 60 km/h for another L kilometers. Next, you are asked to determine the average speed. My question is: although we know that the average speed in this case is the harmonic mean of the two speeds, is it also possible to state that the average speed over this 2L-kilometer stretch can be obtained as a weighted average of the two speeds? Best regards, DaTario
View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
View full post »

Similar threads

I Pair interaction potential with more than one mininum?
Replies
4
Views
3K
Electric Potential Energy of Point Charge Systems
Replies
2
Views
884
Applicability of potential flow theory (fluid dynamics)
Replies
3
Views
3K
I Help with a derivation from a paper (diatomic molecular potential)
Replies
2
Views
913
A Can entanglement be detected in a single Bell pair?
Replies
1
Views
2K
Kinetic energy and potential energy look very dissimilar
Replies
10
Views
2K
Understanding the double square well potential
Replies
16
Views
1K
I Work-Energy Theorem for Moving Block and Spring System?
Replies
4
Views
2K
Implementing “Ab initio” approach in molecular mechanics method
Replies
4
Views
2K
I Potential terms in SE & Quantum Chemistry
Replies
14
Views
1K

Hot Threads

Recent Insights

Back
Top