LabTrack

1 Load a video

Choose or record video

Tips: keep the camera still and perpendicular to the motion, put a ruler or two tape marks a known distance apart in the plane of motion, and use a brightly colored object on a plain background. Everything runs in your browser; the video never leaves your device.

2 Set up tracking

Frame 0 ·

Known distance A→B (m) Frame rate (fps) Hue tolerance (°) Min saturation

Highlight matching pixels

3 Analyze

Experiment Solve for Object shape (known value) Incline angle (°) blank = from track Known g (m/s²) Mass (kg) optional Radius (m) optional

Position

Velocity

Acceleration

Fit residuals

Values come from a least-squares fit of position vs. time (outliers beyond 3σ are rejected). Velocity and acceleration points come from local polynomial smoothing of the same data and are shown for comparison; differentiating noisy positions directly amplifies noise, so the fit is the more reliable number.