1. Video Analysis using understanding of motion to support conceptual understanding in maths and physics

2. What is it? Tracker is a video analysis tool that is free for educational use. https://www.cabrillo.edu/~dbrown/tracker/ It tracks the x and y coordinates of on object on each frame of a video

3. Why use it Students understand motion and can use this to build conceptual understanding of a range of topics. Connection between displacement, velocity and acceleration Modeling and graphing functions Limits and small segments in time

4. How I use it Show a video Ask students to describe then graph distance vs time Describe velocity and graph that Track the object and compare the graphs Fit a model to the graph and discuss the constants Get students to take their own videos to analyse

5. Taking your video Two IMPORTANT factors ● Keep your camera still ● Have a clear contrast between your object and background Less important, but helpful ● have 1m marked on your background

6. Tracking your object Open tracker Import video Select the portion of the video you want to analyse and move the arrows to your beginning and end points Calibrate your measurements – defines the distances used in the analysis >>new>>calibration stick (This needs to be done before you track)

7. Tracking your motion Create>> point mass Right click and rename it if you like Now the cool bit begins! Right click your object (mass A or what ever you have named it) Select autotracker

8. Tracking your motion Contol+ shift, select a portion of your object that is clear Search, then watch the magic happen! If auto track doesn’t work, you can manually change each frame, but that can be tedious.

10. Analysing the data By selecting table, it will calculate other variables

11. Analysing the Data Right click on the table and select Analyze Analyze>>fit a curve will allow you to fit a function to the data. This seems to only work when there is simple motion such as a quadratic.

12. Analysing the Data Select the data you want to graph. The graphs and the data can be easily exported.

13. Resources There is a shared resources section on https://www.cabrillo.edu/~dbrown/tracker/ https://www.cabrillo.edu/~dbrown/tracker/ made by the developers and other teachers. Youtube has a range of tutorials

14. How I have used it Middle School: Analysing egg drop videos IGCSE: Introduction to quadratics and sine/cos curves IB: Quadratics, Sine/Cos and differentiation. Great tool for students to use when doing their exploration.

15. In Conclusion It’s easy to use once you get the hang of it. Students find it engaging. It helps develop students understanding. It’s free. Everytime I use it with students, they teach me a new feature.