• Four types of force are encountered in the universe. The strong force which binds atomic nuclei together and the weak force, encountered in particle physics, are the least familiar, while the other two, electromagnetic and gravitational forces, are also encountered in everyday life. These four forces appear to account for all the interactions of matter which we know about. A force was defined by Newton as anything which alters a body’s state of rest or uniform motion, a definition which he used mainly to describe the operation of gravitation in the solar system. The strong force is expressed by a variety of particles called Quarks and is some hundred times as powerful as the electromagnetic forces, which govern chemical reactions and the emission of electromagnetic radiation. They in turn are some 100 billion times as strong as the weak force, which is itself 100 trillion trillion times as strong as gravitation. This is why a minute pocket magnet can hold a lump of iron in mid-air, defying the whole of the Earth’s gravitation.
  • An influence on a body that can modify its movement, or deform it. For example, if such an influence is applied to a free body, said body would be accelerated. Through the application of a force, work is done. Its symbol is F, and its SI unit is the newton.
  • Any of the four fundamental forces of nature.
  • In computers, to manually intervene in a process, to effect action that would not ordinarily occur.
  • symbol F
  • prefix one thousandth of a million millionth (10-15).

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