I will be using Tracker more this year in my science classes so I am getting ready by filming some of our labs. Yesterday, the class completed the drop the bouncing ball lab by graphing the connection between initial height and bounce height.

We can also use this video to calculate the acceleration due to gravity using Tracker software. I’ll extend this lab next week for the students when they get into the computer lab.

[optinform]

In this video, we calculated the mean acceleration due to gravity at at about -9.7m/s^2. This is close to the official 9.8 m/s^2.

In this picture, you can see the cursor is pointing to the mean for g is -9.68 m/s^2. When we do this in the lab, I’ll have the students video the ball completely from the top all the way to the floor. This way, we’ll have more data.

Below is the video of how I used Tracker to find g. You can also use the auto tracker in this program, but I have not used it yet. The auto tracker is supposed to be more accurate, so I’ll give it a try next time I’m in the lab.

An extension to this lab could be for the students to investigate the standard deviation and the whole concept of variation.

### Kevin

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