Galileo Galilei’s inclined-plane experiment showed that a falling object’s speed increases uniformly with time. By rolling balls down a gentle slope, Galileo slowed the motion enough to measure it more carefully than free fall allowed.
The experiment supported the idea that, under constant acceleration, equal time intervals produce equal increases in speed. The inclined plane did not eliminate gravity; it reduced its component along the slope, making observations practical with the timing methods of the early seventeenth century.
This work helped establish quantitative kinematics and challenged older Aristotelian claims that heavier objects fall proportionally faster. Modern descriptions distinguish speed, which changes during the motion, from acceleration, which remains approximately constant in the idealized experiment.
Accounts sometimes connect Galileo’s falling-body studies with the Leaning Tower of Pisa. The inclined-plane work is the more useful experimental model because it supplied repeatable measurements rather than relying on a brief drop.