[free] "collision"

Collision of free particles moving by inertia 

Hard Dark Old School Underground Hip Hop Instrumental Rap Beat (D-Low Beats) 

In addition to this freestyle mission, We're heading for the new collision, We try to see the it upon all vision, And dare to take a fresh position, To free your mind is our ambition, An end of all your superstition, Cut like a knife, with great prec 

Collision of a free particle with a particle in a chemical element