Figure 1: Materials needed for this are a long measuring stick, wooden support block, clamps, leveler, Gravity Ball (G-Ball), and a flat platform clamped to the top of the measuring stick.
Figure 2: When gravity ball is turned on, it will read 0 seconds since it acts as a stopwatch (left). Flat platform should be placed at desired height on measured stick, and the button on the G-Ball will be pressed against the platform and held there until ready to drop ball (middle). Once ready, G-Ball can be dropped and the stopwatch will go until the G-Ball hits the ground, recording the time of free-fall (right).
