Courant researchers found a way to create gear mechanisms using water through fluid mechanics — how liquids and gases interact with themselves and other objects.  Published in Physical Review Letters, ...

Gears are fairly straightforward way to couple rotational motion, and the physics topics required to understand them are encountered in an entry level physics classroom, not a university degree. But ...

A liquid metal droplet can generate rotation without gears, changing how motors may work in soft and flexible machines.

This article was updated Feb. 28, 2023. It was originally published March 1, 2000. Planetary gears can supply high levels of torque and high-speed reduction. They are also relatively compact compared ...