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OCR: HERE ARE FOUR types of forces that can act between any two bodies, or objects. They account For every force that can be observed in the universe. Forces can have an effect even when two bodies are not in physical contact GRAVITATIONAL FORCE The most familiar force ofall, that of gravity, acts between any two bodies with mass that everything except some he tiny particles inside atoms Gravity can be worked out by measuring the sizes of the masses involved (which have the same value as weight on Earth) and the distances between them. Gravity pulls us down toward the Earth and keeps the Earth orbit around the siut itis the weakest of the four Fundamental forces. WEAK ATOMIC FORCE This force acts between leptons, which are tiny atomic particles existing outside an atom nucleus (center). It is t ...