‘g’ Ball – Free‑Fall Gravity Measurement Timer

The innovative ‘g’ Ball provides one of the simplest and most effective ways to measure the acceleration due to gravity using free fall. Designed to offer accurate timing at an affordable price, this clever device contains an integrated digital timer capable of displaying times from 0.01 to 29.99 seconds.

To use, simply press and hold the button to zero the display, then release the ball from a known height. Timing begins the moment the ball leaves your hand and stops automatically on impact with the ground. For protection, it is recommended to drop the ball onto soft surfaces such as carpet or grass. The ball supports a maximum vertical drop of around 12 metres, depending on landing conditions.

Powered by a replaceable SR54 button cell (included), the ‘g’ Ball is durable, intuitive to use, and perfect for both classroom demonstrations and student‑led investigations. With a diameter of 100mm, it is easy to handle and suitable for all secondary age groups.

Key Features

• Simple and effective free‑fall timing device for measuring gravitational acceleration
• Integrated digital timer (0.01–29.99 seconds)
• Timing starts on release and stops on impact
• Recommended for use on soft landing surfaces
• Maximum drop height: approx. 12m
• Powered by 1 × SR54 button cell (replaceable; supplied)
• Diameter: 100mm
• Durable, student‑friendly design

Ideal for School Science Lessons

Perfect for KS3, GCSE, and A‑Level physics, the ‘g’ Ball allows students to explore key concepts in mechanics through engaging hands‑on investigation. It provides an accessible and reliable method for calculating gravitational acceleration and understanding free‑fall motion.

• Determining the acceleration due to gravity using measured drop times
• Measuring the height of ceilings, stairwells, or buildings using time‑of‑fall data
• Comparing vertical and horizontal motion by:
  • Dropping the ball straight down
  • Repeating the experiment while throwing it sideways
• Investigating motion, acceleration, and kinematics
• Developing practical measurement and data‑handling skills

Engaging, robust, and easy to operate, the ‘g’ Ball provides an excellent introduction to free‑fall physics and makes abstract concepts highly accessible through practical experimentation.