def distance(v1, v2): # simple function to calculate the distance between particle v1 and particle v2 return math.sqrt(Vec3.abs_sq(v1 - v2))
def energie_kin(massen, geschw): kin = 0 for x in range(3): # kinetische Energie = 1/2 * m * v² kin += 1/2 * massen[x] * Vec3.abs_sq(geschw[x]) return kin