9/06 Han

Today, September 6th, the first thing we did was turn our Vector Addition Partner Check that was either completed in class on Friday, or done for homework over the weekend. We then proceeded to check our Vector Addition 1 homework assigned to the class over our long weekend and asked questions if we encountered any problems. As we continued to check the homework, Coat-Haan passed out another partner worksheet, the homework, as well as copy of the unit circle. After we had all finished checking our homework, we passed back the answer keys and told to get out a piece of paper. We took copious notes, learning a new method to solving vectors not drawn at 90 degrees. Our notes included the steps to solving these vectors, what quadrant the vector was in and what action to perform on that angle (nothing, add 180 degrees, or add 360 degrees). As this great class continued, so did the wonderful notes. Coats-Haan then taught the class of the ROXY chart method, which used the other two vectors and their sine and cosine functions, in order to be able to use the Pythagorean Theorem and inverse tangent to find the direction of the third vector. We did an example of how to use the ROXY chart method together as a class and the teacher explained how to solve the problem. We went on to talk about the unit circle, with the copy we received as we were checking our homework. Coat-Haan explained how the unit circle was set up and how to locate the points of different angles (we need to know this chart for the test). Taking the partner worksheet also handed out with the unit circle and homework, we got together with our partners and worked on the problems. After we had completed each problem, we compared our answers with the answers posted on the board. For most of the class, the worksheet was not completely finished, but don't worry, unlike the other partner worksheet, this one did not have to be complete for homework. Instead, if you had completed all the problems up through number 4, you could turn it in. Though the whole class dreaded it, the bell finally rang, signally the end to another memorable Physics class. We all grabbed our homework, which was another Vector Addition Worksheet, and regretfully exited through the door into the crowded hall.

QOD Answer:

ROXY allows us to create a right triangle through the sine and cosine functions. This allows us to then use the Pythagorean Theorem and inverse tangent to find the last vector.