9/9 Haddad

In class today we turned in our homework from last night which was another vector addition worksheet. We also turned in page nine of the lab manual. Page nine was a worksheet that we used a website to construct vectors. The website showed the resultant vector after you put in the vectors that you needed added together.
We were supposed to go outside on the turf to do a lab today but it rained so we had to stay inside. Instead we recieved graph paper and drew out our own football field. In the lab, we recieved an envelope that had directions that we were supposed to follow on the turf. First we filled in the chart with all the directions we were supposed to use to makesure that we didn't go off the turf at all. One of the directions happened to be 120 meters south but we used vector addition to work out the problem. We drew out the directions on the graph paper in blue and drew the resultant vector after. Number 4 on the lab manual asked total distance questions which were really easy.
Then we had to solve for the length and angle of the resultant vector. We used pathagorean theorem and got 72 meters. After we got the length, we used the inverse tangent function to find the angle and got 230 degrees (50+180). The last question asked to find the X and Y components in meters so we used the length times cos230 to get the X component and length times sin230 to get the Y component.
I think the purpose of this activity was to show us how vector addition happens in real life. Also we have a test on Tuesday so this is another way of preparing us for our test.
In my class period, my group was confused on how to show 120 meters south with only a turf of around 90 meters. I raised my hand and ask how we should show this and Coats-Haan said to fill out the chart and see if we answered our own question. As soon as we filled out the chart we realized that we would need to use vector addition and subtraction to show 120 meters south.
Our homework was page 23 numbers 32-34 and also 40-43. I thought that problem 42 and 43 were difficult because they had three vectors. I attempted to solve them by finding all the X and Y components and adding them together to the resultant vector. Hopefully we go over the homework in class.
The Question of the day was when do you know if you have to add 180 degrees to the angle you get when you do inverse tangent. I think that you add 180 degrees anytime X is negative which is both in the second and third quadrant.