Gravity allows traction (was Apologizing for the spinless moon)

> Traction during surface locomotion is greater in an environment with
> higher gravity. Greater traction allows faster starting, stopping and
> course-corrrection. Higher gravity also means greater pour, and
> separation, speeds for liquids. Thus, industrial activity is easier at
> given speeds in higher-gravity environments, ceteris peribus. The higher
> the gravity, the faster the industry.