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HW #2 and Lab Activity #1 extensions – Thursday and Friday, respectively

HW #2 and Lab Activity #1 extensions – Thursday and Friday, respectively Lab Activity #2 (A3-FLOB) due Friday Exam #1 (Chs. 1 & 2) Thursday Read through to p.63 for next Tuesday. Tuesday, February 5 Spring 2008. Energy. Chapter 3. Great Idea :

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HW #2 and Lab Activity #1 extensions – Thursday and Friday, respectively

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  1. HW #2 and Lab Activity #1 extensions – Thursday and Friday, respectively Lab Activity #2 (A3-FLOB) due Friday Exam #1 (Chs. 1 & 2) Thursday Read through to p.63 for next Tuesday Tuesday, February 5 Spring 2008

  2. Energy Chapter 3 Great Idea: The many different forms of energy are interchangeable, and the total amount of energy in an isolated system is conserved.

  3. Energy • Definition: the capacity to do work • A system can gain or lose energy if work is done on it or by it • An abstract concept – we can only quantify it using mathematical formulas • Analogies: Feynman’s toy blocks; money

  4. Work • Work is done when a force F is exerted to move an object over a distance d • W = F × d • unit of measure: the joule (J), 1 J = 1 N·m • Energy is expended when a force acts over some distance to move an object • Not all forces do work

  5. Mechanical Energy Work done on an object is equal to its change in mechanical energy: W = ΔEM = Δ EK + Δ EP

  6. Kinetic Energy • Energy possessed by an object due to its motion • Directly proportional to mass and square of speed of object • Equation: • EK = (½)mv2

  7. Gravitational Potential Energy • The force of gravity gives the object the ability to do work • Equation: EP = mgh • Directly proportional to weight of object and height of its position

  8. Potential Energy • Energy possessed by virtue of an object’s position • Stored energy that could result in exertion of a force • Gravitational potential energy • Chemical potential energy • Electrical potential energy • Elastic potential energy • Magnetic potential energy

  9. Non-Gravitational Forms of Potential Energy • Chemical – energy stored in chemical bonds of molecules • Electrical – energy stored by stationary electrically charged particles in electric force fields • Elastic – energy stored as a result of deformation of an elastic object • Magnetic – energy stored by stationary magnetic objects in magnetic force fields

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