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Kinetic and Potential Energy - and protons • Thermal...

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Kinetic and Potential Energy Kinetic energy is the energy of motion . The magnitude of the kinetic energy ( E k ) of an object depends upon its mass ( m ) and velocity ( v ): In other words, both the mass and the speed of an object determines how much energy it has, and thus, how much work it can accomplish. An object can also possess energy based upon its position relative to other objects - a type of stored up energy, or " potential energy " Potential energy is the result of the attractions and repulsion between objects. An electron has potential energy when located near a proton due to the attractive electrostatic force between them. Chemical and thermal energy are terms which relate to potential and kinetic energy at the atomic level Chemical energy is the potential energy stored in the arrangement of electrons
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Unformatted text preview: and protons • Thermal energy reflects the kinetic energy of the molecules of a substance. Energy Units The SI unit for energy is the joule ("J"). In honor of James Prescot Joule (1818-1889) a British Scientist who investigated work and heat. (Note: SI is short for the French term Systeme International d'Unites . Which defines metric standards). Kinetic energy for example is defined as: Thus, the joule must have units of: kg*(meters/second) 2 and, in fact, 1 joule is defined as: Traditionally, energy changes accompanying chemical reactions have been expressed in calories , which is a non-SI unit (though still widely used). 1 calorie = 4.184 J...
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