Britannica Sources used in this answer

How did Christiaan Huygens contribute to the study of collisions?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A diagram of a cylindrical vessel containing gas, with a movable piston held down by a weight. Countless small dots beneath the piston represent gas particles in rapid, random motion, illustrating Bernoulli's model of gas pressure. — physics As conceived by Daniel Bernoulli in *Hydrodynamica* (1738), gases consist of numerous particles in rapid random motion. He assumed that the pressure of a gas is produced by the direct impact of the particles on the walls of the container.

Christiaan Huygens made foundational contributions to the study of collisions by providing a definitive solution for the impact of perfectly elastic bodies as early as 1656. Although his findings were not published until 1669, they were instrumental in advancing the mechanical philosophy of the 17th century.12

Huygens formulated the laws of conservation of momentum and kinetic energy, the latter being specifically valid for elastic collisions. His approach to these problems was rooted in the principle that in any system of bodies, the centre of gravity cannot rise of its own accord above its initial position. By applying this principle, he successfully addressed the quantitative laws of impact, which were essential for explaining natural phenomena within the framework of matter and motion.21