tracker
Tracker
- Introduced in Physics Olympiad from about 2011
- Introduced in Physics from about 2014
- Introduced in Advanced Physics in 2017
About Tracker
Useful tips
- Object-background contrast:
- Ensure consistent large contrast between moving object and its background.
- Avoid sudden change in contrast or colour from wall to floor.
- Plane of ruler & object's path:
- Ensure that camera captures the ruler placed in the same 2D plane as the path of the moving object, so that x and y coordinates are accurate.
- Any 3D motion may need another camera to capture the 3rd dimension.
- Manual tracking:
- Instead of choosing "Autotracker", we can manually track the ball's position by holding shift button and clicking the mouse at the ball's position.
- The video frame would automatically move to next frame (can increase Step > 1).
- Continue shift+click till end of the last frame chosen. This is more tedious but may be more accurate.
Resource files
- Download the video and trk files for modelling of projectile motion
Applications
Lesson examples