Given a petrological object s with mass m, velocity v, height h, and a constant gravitational force g, it can be determined that the Potential Energy (PE) of s is equal to mgh, and the Kinetic Energy (KE) of s is equal to (1/2)mv^2. If a force f is exerted on object s, causing the velocity v to become greater than zero, it can be shown that the Kinetic Energy (KE) of s will also be greater than zero (it is always assumed any object will have some mass, i.e. m is greater than zero). If the Kinetic Energy (KE) of object s does indeed become greater than zero, it will also exude additional behavior, in that it will be unable to collect any additional mass (m) in the biological form, namely that of plantlife from the Taxonomial Kingdom Plantae, Phylum Bryophyta, and various Classes, such as Sphagnopsida, Andreaeopsida, Polytrichopsida, and Bryopsida.
In summation:
A petrological object with Kinetic Energy greater than zero will be unable to collect addition mass of plantlife, specifically of Phylum Bryophyta.
A rolling stone gathers no moss.