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Unformatted text preview: PHY101: What is energy? What is Energy? • Energy is hard to define in the abstract, so we will answer the above question by example • Is energy a substance, a quality, a book-keeping device, a system of exchange rates, or....? • KEY IDEA: ENERGY IS CONSERVED , or energy is neither created nor destroyed • The law of conservation of energy: total energy before = total energy after Energy is conserved • Note the different meaning from colloquial expression of “We must conserve energy.” • The amount of energy stays the same, which sounds boring, however, energy can transform itself from one form of energy to another • Some different forms of energy: translational and rotational kinetic energy, gravitational potential energy, acoustic energy, internal energy, electromagnetic energy, rest energy, chemical energy, nuclear energy • hand-crank radio: transformation of one form of energy into another Ball drop and energy What two kinds of energy are present? Ball drop and energy What two kinds of energy are present? • Gravitational potential energy: mgy • Kinetic energy: 1 2 mv 2 Ball drop and energy What two kinds of energy are present?What two kinds of energy are present?...
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This note was uploaded on 05/18/2008 for the course PHY 101 taught by Professor Schwarz during the Fall '08 term at Syracuse.
- Fall '08