Reaction forces Chemical bonds 1 Contact angle 1 Density functional theory 1 Electromagnetic environments 1 Electronic structure 1 Electronic.structure 1 Equation of motion 1 Equations of motion 1 First principles 1 Flatter surfaces 1 Frictionless sliding 1 Gravitation 1 Initial velocities 1 Kinetic energy 1 Kinetics 1 Light-matter interactions 1 Minimum value 1 Newtonian mechanics 1 Potential energy 1 Radiation reactions 1 Radiative emissions 1 Simple approach 1 Sliding body 1 Spectra's 1 Spheres 1 State of the art 1 Vectorial mechanic 1 equation of motions 1 frictionless sliding 1