January 13, 2009

Hello everybody. This shall possibly be my last official scribe post for this blog. In addition, today is a big day. It is the day that marks the intervention of having a one month anniversary of blogging absences for this blog. It is also the day that precedes our Gravitational-Electric Fields Test. Good luck to everyone on that. As for what happened today in class, we went through a couple of worksheets and problems. Here is a concise summation of the essential bits gone through below.

We wholly went through Gravitation Fields Review - Worksheet. There exists three sample questions with answers at the very bottom of the last page. Be sure to check that out.

We went through Chapter 2: Motion - Exercise 2-1. Answers are as follows:
1. Greyhound speed=16m/s, Gazelle time=0.01s, and Turtle distance=30cm.
2. a) The BB is gaining distance and speed in each successive time interval.
b) Yes, distance is directly proportional to T^2 (time squared)
c) Distance Fallen: 1, 4, 9
d) Yes; 9cm, 11cm, 13cm. Distance Fallen: 1, 3, 5, 7
e) odd
3. a) 10, acceleration
b) time
c) 70m/s, 245, 10

Green Textbook Questions *forgot pages*
1) 20000 N/C
2) 7 x 10^-5 C
3) 4.44 x 10^-7 C
17. a) 1.6 x 10^-18 C
b) N = 10 electrons

In pre-conclusion, we received Chapter 24: Study Guide - 24.1 Magnets: Permanent and Temporary, The Earth's Magnetic Field, and 1.3 Magnetic Poles worksheets. Oh yeah, people need to scribe. I initially was just going to let the next scribe be anyone that needed to scribe, but seeing as how I took initiative after so many days, I shall choose a person so that they are obligated to scribe. Well hopefully they commit. Hmm. Roses are red, violets are blue, no available scribe name rhymes with blue, so Lynel I choose you :P

December 17, 2008

Hello everybody! This is Alex :) I am scribing today, so lets get started.

Today was a work period so there isn't a lot to say. We had to finish our lab report, once we did that we were required to read page 8 of the white booklet Ms. Kozoriz (sorry if I spelled that wrong) gave us. Once we did that we had to do 4 worksheets. Sorry I don't have a scanner so I can't scan them onto this blog, however they were fairly easy just remember Newton's second law (a=Fnet/m) and Fnet= Fg + Fn. Fg= (m)*(g).

So that was basically it. I hope everyone has a wonderful Holiday and stays warm, see you tomorrow.

For the next post I don't know how the choosing process works so....... um how about Mark. Ms. Kozoriz can change it if she wants.

Tuesday, December 16/08

Sorry for the late post, for thsoe who check this blog regularly, I kinda forgot and just remebered this morning. Well Yesterday we didnt do much. We learned about the weight and scale and how it REALLY feels when you move it up or down. We were also given a Lab to do which is probably due today if anyone is unsure.

Heres the notes she gave us, please make sure to correct me if I'm wrong because I'm writing this based on memory.Also sorry that I can't post any diagrams to explain this better.

F=mg

At this point the weight is at rest so it will feel normal.

F=mg + ma

You move the weight and scale along with it up and this is how it will feel...
It will become heavier at first then at a constant velocity you will feel normal. Then as you start to slow down as you reach the end the weight then becomes lighter.

F=mg -ma

This one is opposite direction with the opposite affect. You feel light at first as you move the weight and scale in the downward direction, then at constant velocity it feels normal. When you the start to slow down towards the end it will then become heavy.

*NOTE* When I say it feels normal it just means you can't tell if it got heavier or lighter then before.

The Lab...

For those who were confused on what they needed to do

What we had to do was get a rubber thingy(don't rember what its called) and tie to to a piece of string that is about 1.5 m's long. You then shorten the string by rolling in your hand to get 1.2m, 1.0m, 0.8m, 0.6m, 0.4m ,0.2m. These are the different lengths that you will be measuring how much time its takes for it to swing twenty cycles( one cycle equals the time it takes for it to come back from where you started it. Remember to start the rubber stopper up to the right of you and keep hand still will doing experiment. Its quite annoying to hold all the time so switch places with your partner if your arm feel tired. Record all the data 3 times each. Then average your time. The period is calculated by the (average time/20 cycles it did). Of course do the Analysis questions after you have completed this experiment and dont forget to hand in.

Sorry once again for the late post as I COMPLETELY FORGOT even though I was told before hand. :S

The next scribe I choose will be Alex Sharp. So good luck Alex with next scribe.

Dec 12 blog

Hey everyone!

Well today in class we got our Newton's Laws of Motions test back, and Ms.K went over the answers for it. So here are the answers:

1. gravitational, electromagnetic, strong nuclear, weak nuclear

2. The coin will land at your feet because it has the same velocity as the bus.

3. The net force would equal zero.

4. Normal force, gravitational force.

5. 75 N

6. It shows the forces acting on an object.

7.

8 a) acceleration will double

br) acceleration will double

c) 1/8 the acceleration

9.a) 4.oN [S]

b)7.8 [at 40° north of east]

10. a=Fnet/m

= 9.50N[S]/20.0Kg

= 0.475m/s² [S]

b) V=(A)(t)

=(o.475m/s²)(1.86s)

= 0.884m/s[S]

11. a=Fnet/m

= 3.2N[E]/ 6.0Kg

= o.533m/s²[E]

12. a=V/t Fnet=(a)(m)

=8.0m/s /1.5s =(5.33m/s²)(110Kg)

= 5.33m/s² = 586N

13.a) b)

After correctin our test we read through the booklet on Gravitational Fields. Then we got 2 sheets, The Elevator Ride and Force and Weight Concept Development. We worked on the Elevator Ride lab for the rest of the class and we will finish it up on monday.

Have a good weekend!! The next scribe will be Nicole. : )