UTF-8Electrical Potential Energy (EPE) - Interaction Energy of charged particles
Please Enter Your name: _____________ 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?
FAR 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.
THE PARTICLES WILL BOUCNE OFF OF EACH OTHER BUT MAY STAY IN THE SAME IN WHICH THEY START OUT GOING BECAUSE THEY ARE IN THE SAME PATH IN THE BEGINNING AND THEY HAVE THE SAME MASS. THEY ALSO HAVE THE SAME AMOUNT OF CHARGE.
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 LEAARNED THAT THE KINETIC ENERGY AND POTENTIAL ENERGY LEVEL OUT NEAR ZERO AS THE PARTICLES HAVE MORE DISTANCE BETWEEN THEM. KINETIC ENERGY INCREASE WHEN THE PARTICLES GET CLOSE AND COLLIDE, WHILE POTENTIAL DECREASES.
Also answer these questions:
3. Does the Total Energy change during the simulation? Why or why not? (Note the Heat Bath is off!)
TOTAL ENERGY STAYS CONSISTENT BECAUSE OF THE EQUAL AND OPPOSITE HAPPENING TO POTENTIAL AND KINEIC.
4. Does the Kinetic Energy of the charged (Ck) particles Change? When does it increase and when does it decrease?
KINETIC ENERGY CHANGES WHEN PARTICLES ARE FARTHEST FROM EACH OTHER BEFORE COMING BACK CLOSE AGAIN BECAUSE THEY BOUNCE HARDER OFF OF EACH OTHER. IT DCREASES WHEN PARICLES ARE FAR FROM EACH OTHER.
5. Does the Electrical Potential Energy (= Interaction energy) change? When does it increase and when does it decrease?
EPE CHANGES WHEN CHANGES WHEN THE PARTICLES WHEN THE PARTICLES COLLIDE AND HAVE CHRAGE. IT DECREASES WHEN THEY COLLIDE AND INCREASES WHEN THE SEPARATE.
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 RANDOM SKYROCKETS AND THEN GOES UP AND DOWN AS MOUNTAINS.
7. At end of the simulation with the other neutral particles present where are the ions? Is there EPE high or low?
THEY DONT HAVE AN EPE BECUSE THEY ARE NOT CHRGED PARTICLES.
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?
IT WENT AWAY TO THE CHRGED PARTICLES AFTER COLLISION.
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).
true14truetrue255 0 0true255 0 0true255 0 0255 0 0255 0 0255 0 0org.concord.mw2d.activity.AtomContainerCollier EPE Exercise 1$0.mmlorg.concord.modeler.PageXYGraphorg.concord.mw2d.models.MolecularModel0Time (fs)Total Energy/ParticleKinetic Energy/Particle CkPotential Energy/Particle600350xy42045-1-1