♥ Support

Projectile Motion

Upload a stroboscopic image or a single video frame showing a projectile at multiple positions. Click each position to digitise it, then follow the step-by-step worked solution below.

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How to use this tool

This tool analyses projectile motion from an image - a stroboscopic photo (multiple positions visible at once) or a composite frame. The worked solution panel on the right fills in as you digitise, showing every equation with your actual values substituted in.

  • Step 1 - Upload your image and set the calibration scale
  • Step 2 - Click each position of the projectile from left to right (or in flight order)
  • Step 3 - Set the time interval between positions (stroboscope frequency, or frame interval)
  • Step 4 - The worked solution computes automatically, showing each equation with values
1
Load Image & Calibrate
Upload a stroboscopic image or any image showing the projectile's path.
2
Digitise Projectile Positions
Click each position of the projectile in flight order (earliest position first). Minimum 3 points needed; more gives better results.
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Load an image above to begin

Click each projectile position in flight order
3
Time Interval Settings
Set how much time passes between each digitised position.
At 25 Hz, time between positions = 1/25 = 0.04 s
m/s²  (9.81 standard; 9.80 at equator; 9.83 at poles)
Status
Load an image and digitise at least 3 positions to begin.

References & further reading

Projectile motion: Hay, J.G. (1993). The Biomechanics of Sports Techniques (4th ed.). Prentice Hall. — Chapter on linear kinematics covers projectile motion in sports contexts.

Air resistance: Mehta, R.D. (1985). Aerodynamics of sports balls. Annual Review of Fluid Mechanics, 17, 151-189. doi:10.1146/annurev.fl.17.010185.001055

Kinematics: Winter, D.A. (2009). Biomechanics and Motor Control of Human Movement (4th ed.). Wiley. — Chapter 2: Kinematics.

Assumptions: This tool assumes uniform gravitational acceleration, no air resistance, and a flat Earth surface over the trajectory. These are valid for most sports biomechanics applications at short range.

biomex.studio © 2026 Andrew Callaway

Worked Solution

Updates as you digitise. Each equation shows the formula, your values substituted in, and the result.

Waiting for data
Digitise at least 3 positions on the image, then click Analyse.