UTF-8Electrical Potential Energy (EPE) - Interaction Energy of charged particles
Please Enter Your name: Dustin Theibert and store the file as "Your Last Name EPE Exercise 1"
Here are two charged particles ("ions") that have the SAME mass and EQUAL but OPPOSITE electrical charges. They exert electromagnetic force on each other.
Review Coulomb's Law on how the force is calculated. As a result of the force there is Electrical Potential Energy (EPE), depending how far apart the ions are.
We want to understand better how energy can be stored as "Electric Potential Energy." In particular we want to understand when ions have more or less PE
Please write your answers to these questions in red color in the space provided:
1a. Before running the simulation -- predict whether the EPE is greater when the ions are far apart or close together?
{Potential would be higher when they are farther apart.
}
1b. Before running the simulation -- predict whether the Kinetic energy (KE) of the particles is greater when the ions are far apart or close together? Initially the particles are not moving.
{Kinetic would be greater when the ions are close or moving closer.
}
1c. Before running the simulation -- predict what will happen in this simulation assuming the particles have no way to transfer energy anywhere else by Radiation, Heat or Work.
Be very specific as to the final locations, forces, accelerations and velocities. Remember that the Total Energy = Potential Energy + Kinetic Energy is Constant! Note that there is no source of friction (dissipation) because there are NO other molecules or ions and the collisions are elastic.
{The ions will collide have an elastic collision and then move apart again. They will repeat and recollide.
}
2. Now run the simulation for at least 20 collisions (at least 100,000 fs = 100 ps) and watch the graphs. Describe what you see that is different from what you predicted. What did you learn?
{Some peaks of KE are higher than others. Granted they are still inversely related to the PE curve.
}
Also answer these questions:
3. Does the Total Energy change during the simulation? Why or why not? (Note the Heat Bath is off!)
{No the system is isolated and there is no energy trasfer. Therefre adiabatic and total energy remains constant.
}
4. Does the Kinetic Energy of the charged (Ck) particles Change? When does it increase and when does it decrease?
{KE changes before and after ions collide. It increases as they are acclerating towards each other and decreases when they are movng apart.
}
5. Does the Electrical Potential Energy (= Interaction energy) change? When does it increase and when does it decrease?
{EPE changes before and after ions collide. It increases as the ions are moving apart and decreasing when they are moving together.
}
6. To create the possibility to dissipate energy, add some (about 10) neutral #3 (Ws) molecules in between the ions to allow for collisions. At the start they will have zero kinetic energy but as a result of collisions this will change. What happens to the KE of the neutral particles
{It increases when the ions collide into them.
}
7. At end of the simulation with the other neutral particles present where are the ions? Is there EPE high or low?
{The ions remain in close proximatey so as the don't move far there EPE remains very low.
}
8. Where did the EPE the ions possessed because of their positions at the beginning of the simulation "go" at the end of the simulation?
{Transfered to KE since they don't move as far apart so EPE doesn't build back up as KE decreases.
}
9. Now apply what you learned -- what ideas does this give you about designing a device to store energy using ions? You can add barriers, more ions, etc. to try to store as much EPE as possible. Describe your reasoning below. When you are done with your design, save and upload to the website.
{Try to keep as far apart as possible. Adding a large barrier between them would prevent the EPE from decreasing drastically.
}
When you are done uploading, send me an email with the link to your file so I can read and give you credit for your work (50 quiz points).
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