Feb. 2, 2010- Scribe Post

Today, we started class by going over Francios and essentially what we covered last class for the people who were at District 3 on Friday. We covered arch length proportions and degrees/radians.






Then, we looked over the radian to degree ratio using the interactive circle, which you can find here: http://www.dudefree.com/Student_Tools/materials/precalc/unit-circle.php
We then raced to see who could get the best time on the scatter game on quizlet. (http://quizlet.com/690390/scatter/). The initial time to beat was 30 seconds. Person with the best time got a I.O.U. We spent some time on quizlet, going over how to use it to study.
Then, Mr. O’Brien gave us some Unit Circle sheets for us to fill in, that when done, should look a bit like this:



















Then, we went over a few more formulas:





























We then covered linear speed and angular speed.
Linear speed is how fast the arc length is changing.
It can be expressed as:






And it is measured in terms of:




Angular speed is how fast the angle is changing.
It is expressed as:


(angle measure in radians)




And measured in terms of:




And finally we took a look at this ‘nice connection’ of the formulas:



















Next scribe was Lange.
Lange named scribe for Monday 2/8/10 as Anna.