Friday, June 29, 2007

Graphical Method

Here's how to get the resultant vector using the graphical method:

1) First, draw a cartesian plane so that it will be easy for you to place your directions and lines.
2) Then place the starting point at zero.
3) Use scaling to in your measurements.
4) Base your angle to the x axis.
5) Then connect your second vector to the first one.
6) Just follow the directions stated in the problem.
7) Then connect the endpoint of the last vector to the point of origin or zero.
8) Then measure it.

So that's it! That's the resultant vector. But you may not get the resultant vector accurately. It may just be close to the real answer because your not solving it, you just draw it. By just drawing it, there's a greater possibility to have an error. ;p

Tuesday, June 19, 2007

Components Method.... ahhhhh.....

Components Method
> one way of getting the resultant vector...

What's???

Vector > direction and magnitude

Scalar > numbers or quantities

How 2 use components method???

To get the resultant vector, we should find first the x-components and y-components of the vectors.

x- component formula usually uses the cosine formula.

y-component formula uses the sine formula.

Sum up the x-components & the y-components. Get the square of the x -components and the square of the y-components... Then get its square root...


The answer is the resultant vector...


to get the direction...


tan-1 (ry/rx)


.....



ok...



thats it!!!



;p

Monday, June 18, 2007

SOH CAH TOA??? waaTTT?!?

SOH CAH TOA
>>
makes us easilly memorize the sine, cosine and tangent thingy.

SOH- means sine theta is equal to opposite leg of the theta over hypotenuse....

CAH- means cosine theta is equal to adjacent leg of the theta over hypotenuse....

TOA- means tangent theta is equal to opposite leg of the theta over the adjacent...


Its just simple...


just based the opposite, adjacent and hypotenuse with the given theta...


Theta is the given angle in the statement...



Adjacent leg can be the hypotenuse that is if it is longer than the other adjacent leg...


But the hypotenuse cannot be the adjacent... Bec. your not sure if the adjacent one is shorter than the hypotenuse...


that's it...



i get it...



but its a little bit confusing... i still need to practice... ;p

Friday, June 8, 2007

Physics...my 1st impression



Before, i just thought of physics as an additional subject or what you call -"the Not so important subject." 'Coz there is biology, chemistry or other sciences that we've studied since grade school. And i now realize how important for us people to learn physics. And well in fact, i will never get to pass college without passing physics!!!!( unless i study an easy course like, fine arts!). Gee... I never realized how important is physics until I reached, 3rd yr. Because, unfortunately, we haven't studied physics as much as we study it now! We go to our physics class and we got out of our class as if we haven't learned anything. Coz we don't really took physics seriously plus sometimes we don't have a teacher. So when we took our exams... we barely even pass. So, it really seems so hard for us to study physics. I hope... I'll focus my studies in physics. I hope so... but I'll really try my best because I know that I'm starting to shape my future. And so... I wanna have a good future!!! ;p