Projectile Tracker · SPICE Robotics

01 / OBSERVE

Start with a video

No clip loaded

Follow the flight.

Open a side-view video, or try the included practice clip.

0.000 s

Frame time appears here.J / L step · K play/pause

Open a video to begin, or use the practice clip.

Points and settings save on this browser. Videos are not stored. Download a session before switching devices.

START HERE

Make the measurement count.

Keep the camera still. Film perpendicular to the plane of motion.
Include a ruler. Put a known length in the same plane as the object.
Track the free flight. Skip frames while a hand is pushing the object or after it lands.

Practice clip

A generated, ideal projectile with a visible 1 m ruler. Calibrate it and mark the orange ball, then compare your measurements with the known values.

Timing & slow motion

Video playback FPS

Controls the step size. Use the file’s playback frame rate (for example, 29.97). Recorded points use decoded-frame timestamps when available.

Slow-motion factor

Normal video = 1. If 120 captured frames play at 30 FPS, use 4. Real elapsed time = video elapsed time ÷ this factor. Do not apply it to footage already exported at real speed.

02 / EXPLAIN

Your measurements

Waiting for data

g = −aᵧ—m/s² · fitted

vₓ at time zero—m/s

vᵧ at time zero—m/s

Speed / angle at time zero—Relative to +x

Your graph appears after calibration and five distinct measurements.

Measured data

Select a row to inspect its frame. Uncheck a point to exclude it from the fit. All points remain in exports. Drag to correct changes position, not time.

Use	Point	Video time (s)	t (s)	x	y	Units