12-5

The class started with Mr. Manning reminding us to bring in our checks for our equation T-Shirts that we could buy from the school. Reminder that all the money is due on Tuesday. Then we got our daily question which dealt with our newest unit on displacement vectors. The problems can be seen in the picture link above. We were to draw two different vectors with the length and degrees of 12.45 cm at 16.1 degrees, and .0390 m @ 128.0 degrees. (Rememeber to use the inside circle of numbers on you protractor going from right to left.) After we went over them as a class we looked at the packet of worksheets that we picked up at the beginnging of class titled "Using Vectors Notes and Worksheet (Pages 11-13). While Mr. Manning was explaining the packet to us, someone in the class wanted to know why this kind of stuff was taught at all, and what the point of it was. Mr. Manning's real world example was that by using vectors, if you wanted to cross a river straight across, but there was a heavy current you would obviously not go straight. By using the vectors, you could determine how far down the stream you would end up. After this example was done we did 2 practice problems dealing with Velocity and Force. Both of which are used in vectors to be used when dealing with either M/S for velocity, or Newtons for Force. By doing a simple cross multiplication problem you could figure out the Force or velocity of the line that you wanted to draw. the proportion is set up as follows: say you were given 1 cm = 15 m/s. You know that you would be dealing with velocity because of the m/s. So you would measure your given line, in the first example in the packet the line was 8 cm. You would set the equation as 1/15 = 8/x. Cross multiply and solve for X. After we did these problems there were still 6 problems left to do in out packet. We were given the rest of class to work on them and if we didn't get done, they were to be done for homework. A-F specifically.