THE DAY AFTER...The Long Weekend

The class stared off with a short little review of the past three classes that the few who went to Moose Jaw had missed. Ms. K went over Coulomb’s Law which is basically a formula to find the electric force:

Fe = k q1 q2 / R²
(k is the only constant in this formula with is 9 x 10⁹⁾

Then she also reviewed Electric Fields:

for a test charge the formula is... E = Fe / q
for a point charge the formula is... E = kQ / R²

Ms. K also reviewed some things from grade 11 on electric fields vectors and what happens to the horizontal components when you have two or more positive charges, negative charges , a positive and negative charge and also changed plates. I don’t own Adobe Photoshop so I can’t really illustrate the diagrams, but we have plenty of notes on it anyway.

After our “spectacular” review we got a new booklet called Gravitational Potential Energy which we went over in class, it shouldn’t be anything new to anyone because and Potential/Kinetic concept is the same as from past units, there’s just a different way of calculating it because we are using Electric fields. The main thing to not forget because we will be using it numerous times is the formula:
1 joules / 1 coulombs = 1 Volt

Things to look over and study from the booklet:
Electric Potential energy – scalar, joules, just energy
Electric Potential – energy / charge, scalar, joules / coulombs or VOLTs
Potential Difference – Change in potential from point 1 to another point

After that we did the Concept – Development Practice Page, and then started the Electric Potential Worksheet. And that’s the end of our class on THE DAY AFTER…the long weekend

The Scribe

So, for this physics class on this lovely, beautiful...Wednesday, We had a substitute teacher (and I know it’s not the Ukrainian Easter), anyhow I believe his name was Mr. “B” and he claimed to know about physics and he sure sounded like it. First, we went over the Gravitational Potential Energy Questions that not many people managed to accomplish Tuesday night. I will not type out every step so people can learn them for there selves, but I will give the answers so the people who weren’t here today, (when I say everyone, I clearly mean Kevin).


So here are the answers:
1. 3.13 x 10 ^ 10 joules
2. -2.36 x 10 ^ 9 joules
3. 2.89 x 10 ^10 joules
4. 2.36 x 10 ^ 9 joules
5. 1.18 x 10 ^ 11 joules

After we finished off with the worksheet, we were showered with a thousand more... a booklet titled 14.5 Escape Speed, and two others with a number of questions called Universal Law of gravity and Gravitational Field’s worksheet. So I’m assuming that we are supposed to have those done for like Thursday and Friday BECAUSE OUR PRESENTATIONS ARE DUE:

NEEEXXXXXTTTTT WEEEEEEKK!!!!! haha