10-10


 * October 10th 2009**- Today's agenda included the daily question, finishing the video lab as well as the XT- graph descriptions work sheet.


 * Daily Question:** Describe this graph



When the graph starts out at a reference point of zero. Initially the graph increases at a fast rate and the slope of the graph is steep. However, as the time (x-axis) increases, the speed becomes slower, causing the graph to have a flatter slope. Mr. Manning pointed out to the class that if there is a positive position, there will be positive slope as the graph moves away from the reference point and negative slope as the graph approaches the reference point.

**Lab:** After discussing the daily question, we met with our partners to finish the XT Graphs of Objects in Free Fall Video Lab. Using the data from Wednesday when we graphed the motion of the basketball during a toss we were able to draw conclusions about the graph. Below is a picture of the basketball's path of motion as it was thrown. This is also similar to the shape graphed on Logger Pro which we used to draw conclusions. From the data we gathered on Wednesday, I was able to draw conclusions that as the basketball was thrown from its starting point, the velocity decreased steadily until it reached the top of its path of motion. Once at the crest, the velocity reaches zero. As the ball continues to its path back to the reference point, the velocity increases to its maximum. From the graph and data collected, I was able to determine that the graph of the filight up was almost symmetric to the flight down. I also noted that the velocity is greatest as the ball approaches the ending point and least at the top.

These were the descriptions I was able to come up with for the graphs: A.) The graph starts in a positive position and decreases speed in a negative direction. B.)  The graph starts in a negative position and decreases speed in a negative direction. C.) The graph starts in a positive position and increases speed in a positive direction. D.)  The graph starts in a positive position and increases speed in a positive direction. E.) The graph starts in a positive position and is a constant speed in no direction. F.)  The graph starts in a negative position and is a constant speed in no direction. G.) The graph starts in a negative position and decreases speed in a negative direction. H.)  The graph starts in a positive position and increases speed in a positive direction. I.) The graph starts in negative position and increases speed in a positive direction. J.)  The graph starts in a positive position and decreases speed in a negative direction. K.) The graph starts in a positive position and decreases speed in a negative direction. L.)  The graph starts in a negative position and increases speed in a positive direction. M.) The graph starts in a position and increases speed in a positive direction. N.)  The graph starts at the reference position and decreases speed in a negative direction. O.) The graph starts at the reference and is a constant speed in no direction.
 * Worksheet:** After completing the lab we worked a worksheet, XT Graph Descriptions.


 * Homework:** As you can see we had a very productive day in Physics today. Although we were not assigned any homework, we will be having a **Quiz on Tuesday on XT-Graphs** so if you are struggling with the concept it might be a good idea to look at previous TPJs or get help from Mr. Manning. Have a great weekend!