UTF-8Electrical Potential Energy (EPE) - Interaction Energy of charged particles
Please Enter Your name: _Heather____________ 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?
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.
Close together
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.
They will attract and when they collide, they will bounced apart with a higher velocity and will hit each other again, but the velocity will stay constant after that.
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?
I see that the system is kind of like a pendulum, where the velocity is smallest at the farthest the atoms are apart and greatest at the moment they hit, accelerating while coming thgether and decelerating when they are traveling apart. This correlates with energy; The potential energy is greatest when they are the farthest apart and the kinetic energy is the greatest at the moment oof impact. However, the total energy remains constant.
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 energy does not change, due to the Conservation of Energy Law. In other words, even though potential energy decreases, kinetic energy increases, thus the total energy remains constant.
4. Does the Kinetic Energy of the charged (Ck) particles Change? When does it increase and when does it decrease?
Yes, as I have explained above.
5. Does the Electrical Potential Energy (= Interaction energy) change? When does it increase and when does it decrease?
Yes, as I have eexplained above.
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
7. At end of the simulation with the other neutral particles present where are the ions? Is there EPE high or low?
They are all about, but together, with a low potential energy.
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?
Into the neutral ions as kinetic energy.
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.
I think that if we can get a way for the atoms to have high PE until the presentation of other molecules (which will transfer the energy from the initial atoms to where energy is needed), then we would have an efficient way of storing energy.
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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