The gravitational force on elementary particles is, however, extremely weak at energies that are accessible at present-day accelerators. Nevertheless the gravitational force becomes important at ultra-high energies as once existed at the beginning of the universe. The electrostatic force of a celluloid board lifting a sheet of paper is often stronger than the gravitational force from the whole earth pulling it down. Electromagnetic Force Not to mention electrostatic or magnetostatic forces, all the forces, except for gravity, we experience in everyday life are electromagnetic. In particular, the force that binds electrons to nuclei to build atoms and the force that holds atoms together to form molecules are the electromagnetic force.
Electromagnetic force is proportional to electric charge.
In other words, they wear a dress of virtual photons. When an electron suddenly changes its direction, part of the photons are shaken off as synchrotron light. The force that can transform particle species as in beta decays of nuclei. Though it plays essentially no role in everyday life, the force becomes very important in the microscopic world of fundamental particles. The force particles mediating the weak interaction, W and Z, have large masses.