10-8

Today, October 8th, we started the class with a homework check. On a half sheet of paper, we wrote our answers for number 1- a. and b. from the worksheet titled, “Average Velocity and Average Speed Homework.” We also reviewed this worksheet. The answers are:

1a. Average velocity= 3.2 m/s and average speed 6.4 m/s 1b. Average velocity= 7.2 mph and average speed 14 mph 1c. No, this is not a reasonable speed for this activity because when the players turn around they slow down which takes time and also they’re doing 20 of them. 2a. Average velocity= 3.2 m/s and average speed= 5.9 m/s 2b. No, the rock’s speed would not have been constant during the whole flight because when it reaches its top height it temporarily stops and then falls towards the Earth.

This worksheet helped us to practice and to better understand how to use average velocity and average speed. As a reminder-

Average speed= distance over time**
 * Average velocity= change in position (delta X) over change in time (delta t)

Then we did the Physics Daily Question. Today’s daily question was, “What would an XT-Graph look like if you walked at a constant velocity towards the reference from the +20 meter mark to the +.5 meter mark in 5 seconds?” The answer is shown in this image: http://canvaspaint.org/4205.png

For the remainder of class we joined our partners to work on the paper titled, “XT Graphs of Objects in Freefall.” First we made our predictions. Then we watched a video of Hunter Eason standing in the front of a classroom, repeatedly throwing a basketball straight up in the air and then catching it. We used the application on the laptops called, “Logger Pro,” to track the motion of the basketball and then make a graph of it. We recorded the velocity and time for each position of the ball, and I expect that we will draw some conclusions from this data on Friday.