Oh no!

Exams is in two days. Is everyone ready? My tip; study hard, look over the review sheet, all your tests, while taking 15 minute breaks each for each hour, and most of all, get an early nights sleep.

For the class on Thursday and Friday, all we did was study for the exam. However on thursday some of went to the UofM to apply for a scholarship. And in case you didn't know, if anyone has an average of 80% or above in atleast 5 classes from grade 9 to 12 are eligible. The scholarship qualifies not only for the UofM but Red River and UofW aswell. Talk to Mr. Purpur for more details, and be quick with it! First come first serve.

So I just wanted to wish everyone luck on their exams! GOOD LUCK! =)

review for last fateful test! & CH 26 review

Chapter 26 review worksheet questions # 1-3 ignore 4&5 # 6-9
Answers on smart board

review for last fateful test! study hard everyone!
test out of 30-35 marks on Electromagnetic Induction including magentic flux, radius's, areas and diameters. need to know how to calculate these using the correct formulas.
A= (3.14)R2

Lenz's Law:
Know it!!
coil and magnet example

also need to know what a traansformer is.
Transformer- convert voltages
Pp=Ps means primary power = secondary power
IpVp=IsVs

Good luck on the test tomorrow and the exam next week

Scribe

Yay...I beat everyone to it. Today in class we started off with a video on Electromagnetic Induction and Alternating Current. The video was approximately half an hour. As we watched the video we filled out a sheet that was filled with questions about the video and we then went over the answers.

After the video we went over study guide number 25 and 26.

We then went over a worksheet titled Grade 12 Physics Worksheet: Electromagnetic Induction

Here are the questions and answers below
1. An airplane travels 1000 km/h in a region where the earth's field is 5.0 x 10^-5 T and is nearly vertical. What is the potential difference between the wing tips that are 70 m apart?
EMF= Blv
EMF= (5.0 x 10^-5 T )(70 m)(277.78 m/s)
EMF= 0.9722 V
2. A straight conductor 10.0 cm long is moved through a magnetic field perpendicular to the flux at a velocity of 75 cm/s. If the flux density is 0.025 weber/m², what EMF is induced in the conductor?
EMF= 1.8x10^-4 V
3. A rod 15 cm long is perpendicular to a magnetic field of 0.45N/(A)(m), and is moved at right angles to the flux at the rate of 30 cm/s. Find the EMF induced in the rod.
EMF= Blv
EMF= (0.45)(0.015 m)(0.3 m/s)
EMF= o.o2025 V
4. What EMF is induced in a 5.0 cm long wire moving with a speed of 10 cm/s across a field of 0.020 N/(A)(m)?
EMF= Blv
EMF= (0.020)(0.005 m)(0.10 m/s)
EMF= 1x10^-4 V
5. A coil of 325 turns moving perpendicular to the flux in a uniform magnetic field experiences a change in flux linkage of 1.15 x 10^-5 weber in 0.00100 s. What is the induced EMF?
EMF = 3.74 V
6. How many turns are required to produce an induced EMF of 0.25 V for a coil that experiences a change in flux linkage at the rate of 5.0 x 10^-5 weber per second?
50 turns
7. A coil of 75 turns and an area of 4.0 cm² is removed from the gap between the poles of a magnet having a uniform flux density of 1.5 wb/m² in 0.025 s. What voltage is induced across the coil?
1.87 V

Class was almost over so we picked up 3 sheets, 21.2 Lenz's Law, Review chapter 26, and Transformers Chapter 37: Electromagnetic Induction. These sheets are to be done for Monday.

* Make sure you have a Physics Exam Review and the answer key.

I think that's it...so have a good weekend :)

Magnetic Fields

Hello Guys............(english,english).Ok what Ms. K discussed today is all about Magnetic Fields.

-One magnetic line is sometimes called Weber (Wb)

-units of B (magnetic field strength)

One Tesla(T)= one newton/(ampere*meter) or Wb/m²

-One Tesla is about 5 Times the strength of an ordinary bar magnet. The earth's magnetic field is about 5 x 10^-5 T (0.00005)

-when we talked about the number of magnetic lines we use the expression Flux, and designate it by the Greek letter "phi"

Electromagnetic Induction

A current set op in a closed circuit located in a magnetic field whenever the total magnetic flux lining the circuit is changing.

Two conditions necessary for an electric current to be produced with a magnetic field:

1. Must have a closed circuit

2. Must have changing magnetic filed

Three factors that determine the value of the induced EMF are

1. Length of the wire

2. Flux density of the field

3. Speed of which conductor moves through field

and the formula....EMF=Blv

and after discussing all of this Jennie and her friend reported about mars exploration,it was supposed to be like past two months ago..

Next scribe would be.... nivram!!!hahahaah

Circuits Exercises

Hello guys!!!! Remember that we are having a test tomorrow so better read your notes tonight because it will help you have great test results. Back to what this blog is all about, Ms. K discussed the hand-outs she distributed last friday. The answers are posted in her slides. Afterwards, she gave us the answers to the exercises but the solutions are not given because she wants us to solve it ourselves. As a feedback, not giving out the solution is a good way to practice what we have learned because it will help us understand the topic more.
The following is from one of our hand-outs. I posted this because this what we need to remember and understand so that we can solve easy and difficult problems.

SERIES AND PARALLEL CIRCUITS

TYPE
OF CIRCUIT

1) SERIES

CURRENT is constant throughout the entire circuit.

POTENTIAL Individual potential drops add up to the total potential drop.
DIFFERENCE

RESISTANCE R_total= R₁+ R₂+ ....

2) PARALLEL

CURRENT Individual currents add up to the total current.

POTENTIAL Potential difference is constant across all parts of the circuit.
DIFFERENCE

RESISTANCE 1/R= 1/R₁+ 1/R₂+ ....

This table summarizes the basics about the series and parallel circuits so if you master this table, solving problems are not as hard as you think it is.

The next scribe is KEITH!!!!!!!!!!!!!!!!!!!!!

Good luck and Godspeed......(",)!!!!!

May 31, 2007

Things we did in class:



- got our test paper back and corrected it.



- Ms.K handed out a booklet called Kirchoff's Contribution that talks about electric potential, electric potential difference, how to determine the resistance, current, voltage, power for series, parallel, combined networks, Kirchoff's Current Law and kirchoff's Voltage Law.



- a cheat sheet called "Series And Parallel Circuits" that talks about the differences between a series circuit and parallel circuit.



then Ms.K gave us a work sheet to do to test our knowledge and skills..to see if we are really listening and understanding the teachings that she just gave us....~~save by the bell! got only number one on the board...will finish the rest tomorrow...^____^



THE NEXT SCRIBE FOR TOMORROW IS...



JAMIE!!! MWUHAHA!

Test Corrections/Series & Parallel Circuits

New unit

Today in class we went over the questions that we were assigned yesterday in our text books. We got a new sheet on current and another sheet on Cavendish and the first electric meter. Also today in class we got two study guides to do in class. we went over Ch.22 study guide today.
Allen will scribe tomorrow.

Physics Class on May 28, 2007

New Topic: Electric Current

Today's class started off with a video on "Electric Current."

KEY CONCEPTS IN THE VIDEO:

- VOLTAGE = ENERGY (JOULES) / CHARGE (COULOMBS)

- CURRENT proportional to VOLTAGE DIFFERENCE

- CURRENT (AMPHERES) = VOLTAGE DIFFERENCE / RESISTANCE

- I = V / R

- DIRECT CURRENT: A current travelling in ONE direction.

- ALTERNATING CURRENT: A current alternating back and forth.

** Basically the video was an overview on series and parallel circuits.

For the rest of class we were assigned the following:

Read PGS. 469 - 475
Do Practice Problems:
PG. 471 - 472
#1 - #4
PG. 474 - 475
#5 - #8

The next scribe is: GEAR321 (AKA. Eddie)

Sorry i posted this too late, i didn't know i'm supposed to blog last thursday. Well
last thursday Mr. Newman was substituting our class. He assigned our class to answer the " Moving charges worksheet" number 8 to 16 and then we went over the answers. Before the end of the class he gave out 4 handouts for us to do for homework... and that's all i remember.

since someone is chosen to scribe today. i don't have to choose who to scribe next! YEy.

May 22 2007

we started off with question #7 on the test corrections...
next Mrs.K handed out a booklet which she read over to us...I suggest you read it...its very important.
Then we were assigned questions which she also handed out..."Moving Charges Worksheet"
do questions 1-16 but omit 5 6 and 7

the answers to:
1a) Fg is greater than Fe therefore the drop falls.
b) 3.45 x 10^-4 N [down]

2) 4.6 x 10⁶ m/s

3)2.24 x 10^-13 N (down)

next scribe will be ricardo...

scribe post - lindsay

This is Lindsay scribing for Thursday's class.

We first watched a video on electric fields. Here are the answers from the handout:

1. charge, potential, field
2. determine height above sea levels
3. field lines
4. hard
5. no
6. down
7. elevation; downward slope
8. E=-v/R
9. direction
10. 1/R₂
11. inverse
12. no
13. constant height above sea lel
14. yes; electric fieldis perpindicular to the surface
15. 10 000
16. ionizes the air, electrons accelerate
17. ability to do work when electrons flow; volts
18. Ep=qV
19. charge in chemical form
20. charge, energy electrical field, foce, volt/potential difference

We got another work sheet. Here are the answers:
1. loss PE = gain KE
2. force; distance; W=Fd; increases; equal
3. potential; voltage
4. 1V
5. 12J
6. 5000 V
7. 5000V
8. 5000V
9. .005J
10. charge

We did a lab and hand that in ASAP

We also got more handouts and a worksheet for long weeked homework!

next scribe is...caroline

HEY HEY HEY! Well for those who missed today's class we received a couple worksheets, which pretty much is about ELECTRIC FIELDS. We also talked about the differences between electric force and electric field, also the differences between gravitational field and gravitational force. Also a handout of Electric Potential. That's what we pretty much did in class today. SO FOR THE NEXT SCRIBE........I PICK........



LINDSAY

Heeey guys!!! It is Linger here, and I am your scribe for today and yesterday's class. Anyway, let's begin!!!

Yesterday was the last day of presentations for our projects on Space Exploration. We had Mark present his but due to technical difficulties, others could not present theirs. If you haven't already presented yours, all you need is a group of 5 volunteers to watch your presentation during a lunch hour... it's better late than never! We also had the worksheet called ELECTRICAL FORCES. And that brought us to the end of class. Homework was to finish number five.

In today's class, we corrected the worksheet and Ms. Kozoriz explained how to do number five. We also got a booklet about Coulomb's Law. The first page was based on One Dimension. The second page was about Two Dimensions using equilateral triangles. The third page was about Two Dimensions using squares with indvidual forces and last page was Two Dimensions using squares and adding the forces. The booklet was pretty straightforward. It tells you what to do step by step in certain situations. Remember to convert the measurements to meters if it is given in centimeters. Also, remember to square the value in the denominator!

After discussing this booklet, we were to read pages 415-420 in the red textbooks. For Practice, do problems 1-5 on page 420. Questions 15 and 16 on page 423 are to be handed in for marks and in order to write the unit test.

Well that is it for me. For further help or explanations, make this blog your friend and scroll down to the slides that was posted for today and/or yesterday's class. Anyway, the next scribe is none other than....

BAAAALEEEE!!!!

Hello I'm Albert, the scribe for this weekend.

What we did last friday was....what was it?

oh!some of my classmates including me did the bus ridership.
After we went back, we continue to watch the presentations by our classmates.

The first group was about disasters that happened to astronauts here and in space.
The second group is about the tools that scientists used to explore space.

and that's it..

Next scribe is jillaine!

Project Presentations/Start of Electric Fields

For today's class, students presented their Astronomy projects. And tomorrow, there will be 6 (assuming) other students presenting their projects as well. After the presentations, we started on Electric Fields, and were handed 2 sheets. Tomorrow's scribe will be Albert.

TODAY was the test of the "Exploration of Space and Low Earth Orbit". It was just a one yellow page and that is worth 42 marks. We used the foolscap paper to answer the test. There are only 13 questions, and worth either 1, 2, 3, 4 or 5 mark each! WEll thats all the information i can give out today just because there are a few students who didnt do the test! Good luck to those who didnt do it yet!


The nex SCRIBE is......VAN

Scribe Post

Ok, today we reviewed for the test tomorrow, If you skipped or are in Cal. you should talk to someone that was in class, because the test will become more clearer with the notes. Also we started our presentations on the Space stuff. (I went first, heh bonus marks...................................). And thats it, and remember Ms. K, BONUS MARKS!! :D



Next Scribe is: charlotte

MAY 1ST & 2ND, 2007

So today in Physics we went over a few worksheets.
See the Slidehare below for the answers.

DO 31-33!!!!

NEXT WEDNESDAY IS THE TEST! (EXCEPT FOR CALCULUS CHILDREN)
PRESENTATIONS ARE ON TUESDAY AND THURSDAY.
***BONUS POINTS FOR PEOPLE WHO PRESENT ON TIME.

May 3 -
We watched a video on satellite motion. Ask Ms. K for the worksheet you missed.

NEXT BLOGGER IS ...JOHNNY!

Scribe post: may 1, 07

For Today's class:
- Circular Motion, Work and Energy Test was handed back
- Chapter Eight lab was handed back


After everyone received their work, Ms. K went over the answers for the test.

Here is the demonstration presented to the class:

Energy is used to move the rocket away from the earth. When the rocket moves an infinite distance away from the earth, the gravitational potential energy that the rocket possesses is 0.












Newtons Law of Universal Gravitation:
F_g = (GM₁M₂)/R²

F is proportional to R²

vector quantity

measured in Newtons

Gravitational potential energy:
E_gpe = - (GM₁M₂)/R

E is proportional to 1/R

scalar quantity

measured in joules

After this, we did a transparency sheet, which we handed in. For the rest of the class a Gravitational fields worksheet was handed out. There were also questions on page 273 of the DUCK book... QUaCK QUaccKK!!


NExt scribe is the person who was supposed to be scribe today. =\