Open a video of your experiment
or drag a file here · Your video stays on this computer — nothing is uploaded.
0.000 s
How long is the line you drew in real life?
Open a video to begin. Tip: film with the phone on a tripod, straight-on, with a meter stick in the shot.
Any subjectMotion tracking
Video Analysis
- Set scale: click both ends of an object of known length (like a meter stick), then type its length.
- Set origin: click where you want (0, 0). Up and right are positive.
- Go to the first frame where the object moves and click t = 0 here.
- Mark points: click the object. The video advances automatically after each click.
- Graph position or velocity vs. time. Velocities are calculated from neighboring points.
Check the frame rate: most phones record at 30 fps; slow-motion is often 120 or 240 fps. MP4 (H.264) videos work best. iPhone users: set Camera → Formats → “Most Compatible”.