UTF-8Electrical Potential Energy (EPE) - Interaction Energy of charged particles
Please Enter Your name: ___Sequoia Dawson__________ 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?
{I think that the EPE is greater 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.
{The kinetic energy of the particles is higher when they are closer 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.
{The particles are going to bounce off one another and will go back to he same position. The velocities of the particles are going to be low and they decrease because they kind of come to a stop after hitting one another.
}
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?
{The kinetic energy is going up while the potintial is decreasing when they hit one another. So i think its the closer they are the lower the potential energy is and the farther they are apart the higher the potentia energy meaning vis versa for kinetic energy
}
Also answer these questions:
3. Does the Total Energy change during the simulation? Why or why not? (Note the Heat Bath is off!)
{The total energy stays at a constant because the conservation of energy is happening so its the transfer of energy between the kinetic and electric potential energy
}
4. Does the Kinetic Energy of the charged (Ck) particles Change? When does it increase and when does it decrease?
{Yes it does. It is higher when they get closer to one another and they are lower when they are farther apart
}
5. Does the Electrical Potential Energy (= Interaction energy) change? When does it increase and when does it decrease?
{Yes it changes between the time of the interactions. It is lower when they are far apart and higher when approaching one another
}
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
{The kinetic energy becomes higher between the collisions because they have more collisions that have happened to the neutral particles
}
7. At end of the simulation with the other neutral particles present where are the ions? Is there EPE high or low?
{The ions are moving all over and have no particular position. The EPE is lower now because it has more kinetic energy than potential
}
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?
{The EPE has transferred to the neutral particles
}
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.
{
}
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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