One of the essential features in physics is the happening of forces that keep matter together. There are for instance, the forces that remain the cells together to increase the human body, and there is the gravitational force that remains us on the ground and the moon in orbit around the earth. We can ourselves use forces when we push something and by engineering, get some of the energy content in oil to make a force on the wheels of a car to move it. From the macroscopic viewpoint we can imagine a lot of different kinds of forces, forces that proceed at impact but also forces that do something over a distance for example the gravitational one.
In physics, though, we attempt to systematize and to discover as many general concepts as possible. One such systematization is to find out the ultimate constituents of matter. One more is to discover the forces that act among them. In the primary case, we have been capable to divide up matter into atoms and the atoms into nuclei and electrons and then the nuclei into protons and neutrons. By colliding protons by means of protons or protons with electrons, particle physicists have uncovered that all matter can be built from numerous quarks (a concept initiated by Murray Gell-Mann in the 60's) and leptons (electrons and neutrinos and their heavier cousins). In the same procedure physicists have exposed four basic forces that act among these matter particles - gravitation, electromagnetism, the strong and the weak nuclear force.
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