Today's Slides: April 28

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BOB

Hey everybody ! Test is tommorow! At the moment I'm studying as much as I can to do awesome at this test because I really want to pass this course. The unit is pretty easy except for the wording of course *sweat* I have trouble understanding the wording of the questions for this unit >< But I think once I get it it's gonna be a bit smoother on the road to answer the questions.

Well for this unit I learnt how to properly use the protractor once again *laughs at self* I had forgotten how to actually properly use one=S but, luckily I slowly remembered how to and I've been doing alright for the questions. Good luck on the test tommorow guys going back to studying!

BOB- vectors

ok for some very strange reason i find this unit quite difficult at times but i hope that by practicing more with the formulas that adamson referred to, i can figure out the problems i just think that i get stuck when it says "due" or "with a bearing" in the word problems. otherwise i think i'll be ok... but i gotta go back to studying =(

BOB

Hey guys its alvin. right now im studying for the test tomorrow. the only muddiest point i have is the wording, some of you guys probably have the same problem as me. but 1 thing that i found useful is if u actually write the actual words down on ur paper, it begins to make sense. per instance:

1 banana vs 1 apple

re-write 1 banana then below it write 1 apple. then all u have to do is figure it out 1 by 1. my strength pretty much if i get the wording, i can solve it right away- -so pretty much everything is okay, im just worried about the wordings for tomorrow. well goodluck guys!

Dear BOB

Dear BOB,

So there's this girl(LOL). That's not my BOB. Anyways. Guys study for your test tomorrow. Do more problems. Go over all the problems that we did in class or homework. Make sure we all get it. Vector is one of the easiest unit but we still got to do our best to pass the test. Well, the part I didn't get in Vector unit is how to find the BEARING. But as I re-do all the problems we did then I'll be able to get it hopefully. The one thing I understood and liked about the unit is measuring. Using a scale and sketching on the paper and writing down the right degree. So, I think that's all for now. Good Luck on the Test tomorrow. Eat an energy bar(VECTOR) before you take the test to do well for the test. Alright laters mathers.

Yours dearly,
Wilfred N.

BOB

Alright, test moonday on vectors; probably the shortest unit in this class. I really don't find anything too difficult in this unit, except when trying to draw the diagram; I tend to overthink the question an second guess my diagram. That would be my down fall to this test; don't overthink the question.



Formulas you should remember (all found in April 22 slides):

- Sine Law

- Cosine Law

- Pythagoras Theory

- Properties of Angles



Another thing you should remember to use is, the TRISOLV2 program which can help you find angles and sides (TRISOLV2, April 23 slides). You can use the TRISOLV2 program to try to solve the question; you can also use it to help check your work. All in all goodluck to everyone on the test tomorrow.

Oki ...CowMIlk continue to be the scribe T_T . How about your pre-test ...that was not easy :P and I hope the real test will easy . Friday, we worked on the pre test and corrected the "challenge question", and we had a small problem... Let's check the answer of "challenge question".

This is wrong because the question is : "the ship NEED to travelin direction of 40 degree" , not "the ship to travel in direction of 40 degree ". So the resultant vector must be bearing 40 degree and the ship must travel with the vector which add the vector of current = the resultant vector ( we thought the ship travel in direction of 40 degree and is pushed by the current <== that 's wrong, the ship must keep its direction of 40 degree).

So the right answer must be :

Next scribe will be Carmel

HI allll !! Test tomorrow >"< .In this chapter, we just have few formulae: law of cos, law of sin, Adding 2 vectors, but when apply there formula to exercises, we must be careful . Finally..good luck

Well the test is on monday, and i hope i do good, but the problem i have is drawing the diagram. I can do everything else okay, but its difficult for me to draw the diagram. I'll ask others on how to draw the diagram, but i'm sure i'm not the only one with this problem.

Today's Slides: April 25

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Hey guys the scribe post for today was me and well I will be happy to say that our "Vector Unit" is finished! Which will lead us to our "Personal Finance Unit" I'm assuming. The pre-test is tommorow I hope all of us will do well for the both the pre-test and the real test. I'm still not that confident with the vector unit but, I'm pretty confident of this question which I answered in the homework given just a day ago.






First Step: You are given an angle of 150 degrees and a magnitude of 550mph. Draw a Cartesian plane and then use a protractor to measure the angle of 150 degrees and draw a line for the first line.

Second Step: With the 2nd angle and magnitude given draw the line which is a bearing of 80 degrees and a magnitude of 175mph.

Third Step: Draw the Resultant vector by drawing a line from the tail of the arrow to the tip.

Fourth Step: Find the angles and sides you have and see what formula to use which in this case is the Cosine Law because you have a Side, Angle and Side.

Fifth Step: Square root the answer you got to get the answer by itself and not squared.

OR

You step most the Fourth and Fifth step and just use the program "TRISOLV2"

Well this ends my Scribe post for today and the next scribe will be... CowMilk

BOB

Kay so...since we're going to have a test real soon, I'll post up my blog now. Um.. this unit went by pretty fast compared to the other units and I'm not sure if I'm even ready for the test. I found drawing vectors in scale diagrams the easiest. However, what I found difficult was seeing the letters in the angles.. the alternate sides and corresponding sides.. the Z's and the F's. But after going over the homework from previous nights I think I got the hang of which angles belong where. The only thing I'm concerned about now, is whether or not I'm doing the work right... Mr. K, can you post up the answers to our homework so that I can compare my answers to the actual answers to the questions? It'll help me a lot when I study over the weekend =). Anyways, the other thing I don't understand is how to use the function TRISOLV2 on my calculator because the day we were learning how to use it, my batteries died out. But I don't mind it much because I like dealing with the formulas Sine Law and Cosine Law. Other than that, I hope I do well on both the pre-test and the test 'cause I really want to bump up my mark.

Today's Slides: April 24

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The next scribe will be.......................................................................................................christine m.

Today's Slides: April 23

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Scribe Post April 22

Hi guys, today we studied about solving problems using Trigonometric Method: Pythagorean Theorem, Law of Sine and Law of Cosine.

You can use Law of Cosine when you have Side Side Side (SSS) or Side Angle Side(SAS). Otherwise, you can use Law of Sine to solve the problems.


We also did an example by using Law of Cosine and Properties of angles. Here are the answers:
_ Magnitude of the resultant vector: 0.0644 N
_ The direction of the resultant vector: bearing 70.48 degree.

The next scribe will be ickie .

Today's Slides: April 22

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Scribe Post - Vectors

Hey guys, I'm the scribe post for today, April 21st.

**SORRY YOU HAVE TO CLICK
THE PICTURES TO HAVE A BETTER LOOK AT IT**

As most of you should know, we had a substitute today for class.
We were given a worksheet to complete on vectors.
Here it is...







Tomorrow's scribe will be . . . . .
NguyenX
(unless someone would like to volunteer *evil stare*)

Vectors Scribe Post

Sorry for the late post guys. here is just a quick rundown of the stuff that we learned from vectors.

For people that were confused about what the difference is between scalars and vectors, here is the definition:

Scalars are quantities which are fully described by a magnitude (or numerical value) alone.

Vectors are quantities which are fully described by both a magnitude and a direction.

If you have more troubles with scalars and vectors, check this site out:

http://www.glenbrook.k12.il.us/gbssci/Phys/Class/1DKin/U1L1b.html

Alright Ladies and Gentlemen, I don't really have such fancy tools to do this post, but i'll try to explain what we learn.

Adding Vectors Using Scale Diagrams..
-A vector is represented by an arrow. Its LENGTH determines its magnitude and the tip determines direction.

The Triangle Method : Tip to tail.

The red: Is the resultant of the two vectors
The Black: are the vectors in which the arrow, connects to the
end of the second arrow(vector). Which is why it is called tip to tail.

Practice:
Basically we measure using a ruler.
then measure the 2 end points to find the resultant of the two vectors.







The Parallelogram Method: Tip to Tail
The red: Is one vector and the other red one without the arrow is the mirror image on the other side.
The blue: is the other vector, with the same mirror image.
The green: is the resultant of the two vectors.
Now see how the two vectors tails connect, thats why its tip to tail.
the arrows show the directions each vector got copied from.
I don't see the big difference, the resultant is still the same as a the triangle method.
Practice:
So all we use is a ruler to find the lengths, but if you wanna find the angles, you got to use a protractor.


This is basically what we learned because we had the afternoon off. The next scribe is C.J