Electrical Force - The interaction between a charged particle, Electromagnetic Force - The interaction between a charged particle and an electromagnetic field or between two charged particles, Fission - nuclear reaction in which a heavy nucleus breaks into two lighter nuclei, releasing energy, Fusion - A nuclear reaction in which two lighter nuclei combine to form a single heavier nucleus and some of the original mass is converted to energy, Gravity - A mutually attractive physical force of nature that causes two bodies to attract each other, Gravitational Force - A force of attraction between two masses, Magnetic Force - A force of attraction or repulsion that arises between electrically charged particles because of their motion, Mass - A measure of how much matter is present in a substance, Mass-Energy Equivalence - The principle that mass is concentrated energy; the amount of energy in a given amount of mass can be calculated with the formula., Neutron - A subatomic particle of the nucleus of an atom that is without charge and contributes to the mass of an atom, Nucleus - The tiny, very dense, positively charged region in the center of an atom made up of protons and neutrons, Photon - An elementary particle that is the smallest possible amount of light and all other forms of electromagnetic radiation that can interact with anything, Strong Nuclear Force - The force that binds the protons and neutrons together in the nucleus, Weak Nuclear Force - A weaker, non contact force that governs the radioactive decay of subatomic particles,

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