How did Galileo Galilei use inclined planes to study motion?

Galileo Galilei utilized inclined planes as a critical experimental tool to study motion, effectively overcoming the limitations of measuring rapid free-fall directly. By rolling balls down gently sloped channels, he was able to slow down the motion, allowing him to measure time and distance with greater precision using tools like water clocks.12

His key findings through these experiments included:

• Uniform Acceleration: Galileo observed that balls rolling down an incline experienced constant acceleration, and he deduced that this same principle applied to objects falling freely in a vertical direction.12
• Law of Falling Bodies: He discovered that the distance a body travels from rest is proportional to the square of the elapsed time, a fundamental principle of kinematics.324
• Inertia: By observing a ball rolling down one plane and up another to regain its initial height, he reasoned that on a perfectly horizontal surface, the ball would continue to move indefinitely. This insight challenged the Aristotelian requirement for a constant force to maintain motion and laid the groundwork for the law of inertia.1

These experiments allowed Galileo to move beyond Aristotelian physics and establish a mathematical foundation for classical mechanics.12