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

GRAVITATIONAL POTENTIAL ENERGY

Hi everyone, its Elizabeth

Today, we had a lesson about gravitational potential energy. We did a transparency worksheet. Ms k gave us a work sheet for the rest of the class, that's about it. Just so you know, we're about half way through Exploration of Space.

Night!

friday-april 25, 2008

ooohhh... nobody posted anything for last friday... sooo.. here goes. =)

friday-april 25, 2008

sub- mr. babisky

we went over the other side of the study guide- 8.2 USING THE LAW OF UNIVERSAL GRAVITATION

here are the answers

MOTION OF PLANETS AND SATELLITES

1. parabolic
2. vertical
3. horizontal
4. horizontal
5. Earth
6. orbit
7. uniform circular motion

WEIGHT AND WEIGHTLESSNESS

1. acceleration
2. inverse
3. 2nd
4. decreases
5. freefall
6. upward
7. weightless

THE GRAVITATIONAL FIELD

1. gravitational field
2. gravity
3. inversely
4. square

EINSTEIN'S THEORY OF GRAVITY

1. force
2. space
3. curved
4. accelerated
5. relatively
6. sun
7. blackhole
8. mass


** after going over the study guide he gave us a little time to finish up the sheets- CHAPTER 11: GRAVITATIONAL INTERACTIONS and INVERSE-SQUARE LAW. after 20 mins or so, we went over these sheets.

here are the answers

CHAPTER 11: GRAVITATIONAL INTERACTIONS

1. 4F
2. 4F
3. 16F
4. stays the same
5. 2/9F
6. stays the same

INVERSE-SQUARE LAW

1. 9 area units - 1/9 mm thick
16 area units - 1/16 mm thick

2. 25 meter squared
100 meter squared


**after the sheets he gave us an assignment--- page 160 practice problems 1-4 and page 172 problems 1-5 (from the green book) for the remaining time we had.


i guess that's what we did last friday... =)

Scribe Post #3

Well since there looks like there has been a slump in the scribing over the last couple of days I think this is a good time to finish up my last scribe post.

Today in class we started off by getting back our Circular Motion & Work and Energy tests. We then went over the answers with Mrs. K and made sure we had the correct answers.

We then moved onto watching a video. The name of it was "Kepler's Three Laws." After watching that and answering the question sheet, we went over the correct answers for that.

"Kepler's Three Laws."

1. Each planets path is an ellipse and each planet moves around the sun which is called the focus.

2. The imaginary line from the sun to a planet sweaps out equal areas in equal time intervals. Planets move faster when closer to the sun and slower when farthest from the sun.

3. The ratio of the squares of the periods of any two planets revolving about the sun is equal to the ratio of the cubes of their average distances from the sun.

The video took the greater part of the class and we were left with about 20 minutes to finish up Study Guide 8. Also those who missed the lab yesterday were given time to finish that up.

That was it for today and i'll see you guys all back in class tomorrow.

04/18/08 - The Scribe #2

Friday's class...during that class, we went through the questions that were assigned (green book. page 213, 227). I would post the questions/answers but I did not get all of them. Following that, we had a choice. Students either did this lab pertaining to cute whined-up toys or used the class time to study for Monday's test. That was about it.

Good luck on the test everyone. The next scrible will be Aznflame.

&& finally...

Okay.. so both kadeem and i kind of 4got about the blog.. haha.. opps..
but here it is:
2day we went over all the answers 4 the assigned qus. yesterday. the answers + some of the work was (fr. the green book, pg 213):
#1: w=Fd
w = (80N)(10m)
w = 800J

#3: W = 176J
d = 0.3 m
w = Fd ---> F = w/d
= 176/0.3
= 586.6
#5: (0.25)(0.12)(3) + ((0.23-0.12)/2) = 0.145
#8a)
b) w= Fd
= 1319
c) w = -11319J
#10: F = 845N ; d=185m ; w=1.2*10^4 J
w = F cos (feta) d
(feta) = 60 degrees
#12: Now work is done as F 10 is perpendicular to the distance
#17a: F = 9.8*240
#17b: both distance and work = 0
#17c: w = Fd
-5527.25
# 17d: No it does not exert any force
#22a: cos 32 = 805 N/ H
#22b: F = 805N
angle = 32 degrees
w = Fd
w = (805)(22)
w = 17710 J
# 22c: w = 17710
t = 10s
p = w/t
= 2213.75 watts
#23: F(2) = F(1) cos 45
=(42.3)(cos45)
= 29.91N
w = Fd
w = (29.91)(16)
w = 478.56 J

p = w/t
p = 478.56/3
159.52 watts

... wow that took long

&& hw 4 2night is.. 1, 3, 6, 9, 10, 12, 14, 21, 23 on pg 237

scribe ... i don't know whoever wants to be =)

April 16, 2008

Hey it's Kevin. On April 16th we corrected the chapter 10/11 study guides which included 10.1: Energy and Work, 11.2: The many forms of Energy, and 11.2: Conservation of Energy. We also corrected the Concept-Development Practice Page 8-3 worksheet on momentum and energy. For the rest of the class we worked on questions from the green text book.


next scribe is ...........kadeem

Hooke's Law

Hi everyone, it's Elizabeth


Today, we have done the correction of the study guide which is chapter 11, we did 11.2 CONSERVATION OF ENERGY. Ms.K taught us the FORCE AND THE SPRING from the WORK AND ENERGY handout.We finally did a lab - HOOKE'S LAW. I guess thats about it.

night!

Work and Energy.....

Hi, it's Febi again and it's Monday, I'm scribing for Monday cause the next person was not in class today.....

For today's class, we revised the Energy in it's Many forms study guide.
We also did the second page which is Conservation of Energy, pg 227- 231 in the green book.(we'll go over it tomorrow).
Ms K. gave us Momentum and Energy Worksheet and we went through the notes for Work and Energy.

As I said on friday, there's a test coming up and it's gonna be on the 21st (mon) so get ready............
It'll be on - Circular motion
- Work and energy.


Next scribe is ......................Elizabeth.

Down the Hill Lab...........

Hi everyone, it's Febi. I'm scribing for Friday.
In Friday's class, we did another Lab titled Down the Hill, pg 330 in the green book.
Ms. K also handed out a study guide titled Energy in it's many forms. The lab that was done on Friday is due on monday, so you might want to get it completed over the week end. This lab kind'a explains KINETIC ENERGY and POTENTIAL ENERGY.
Ek= 1/2 m(v.v) (get the idea ? half of the mass times v- squared.)
Ep= mgh (mass. g. height).
I think a test is around the corner, don't know when but just get prepared. Later Peeps.

Next scribe is.....Elizabeth.

Thursday April 10, 2008 (Scribe 2)

Hey everyone it's me Robert again. Well today in Physics class we started off by correcting and going over the Chapter 10 Study Guide for 10.1 Work and Energy.

Two things to note from the study guide:

• Work = (Force)(Distance)
• Power = (Work)/(Time)

Next we moved onto our lab that Mrs. K had ready for us. The objective of the lab was to see how much work and power a person could create walking up a flight of stairs. Once we did that we filled out the analysis and application part of the lab and handed it in.

Also Mrs. K assigned some work (at the same time as the lab) to do in the duck book.

• Duck Book : Read p. 325 - 330 & Do Problems 1 - 6 on p. 330

That was it for Today's Physics class and I will see you all tomorrow!

The next scribe is Kevin!

Wednesday, April 9, 2008

This class we got a lot of work done. We first started by going over the Centripetal Acceleration and Centripetal Force worksheet. It was pretty simple, basically plugging in numbers into the formulas. Next, we went over the Acceleration and Circular Motion worksheet. It involved the car and directions of the force. It was pretty straight forward and was almost all common sense. Then Ms. K handed out a worksheet titled Centripetal and Centrifugal Forces. Please make sure to read over this as it is very necessary. We also picked up another Study Guide based on Work and Energy, as our next topic. Fun, quick, easy class!

Next scribe will be Robert.

Today's lesson

Today Ms.K showed us how to derive the equation for centripetal acceleration. After that we worked on the worksheet called centripetal acceleration that was given before the break. Those people that had missed the lab from yesterday did that today as well.
Tomorrow's scribe will be........Bertman

Derivation of Centripetal Acceleration

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Welcome back!

Hello everyone, it's Allyson.

I hope everyone had a well rested and fun spring break. I sure did. But now it's back to school and it's time to pull up our socks because grad is just around the corner. =(

Anyways in class today we did a lab on Centripetal Force. We timed how long it took for a rubber stopper tied to 0.8 m of string from a rod to go through 30 revolutions while spinning it above our heads. The velocity must be constant at all times to have accurate results. We also added 5 washers after each trial to add weight and to see how the results have changed.

We needed:

• to calculate the time for 1 revolution
• speed (m/s), and
• speed^2 (m's)^2

There are two graphs needed to be handed in; force vs speed and force vs. speed^2 along with the questions attached to the back of the worksheet. The lab write up is due tomorrow, so if you weren't in class today be sure to pick them up.

Take care, see you all tomorrow.
-- son.