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.

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Presentation transcript:

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: The many different forms of energy are interchangeable, and the total amount of energy in an isolated system is conserved.

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

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

Mechanical Energy Work done on an object is equal to its change in mechanical energy: W = Δ E M = Δ E K + Δ E P

Kinetic Energy Energy possessed by an object due to its motion Directly proportional to mass and square of speed of object Equation: E K = (½)mv 2

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

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

Chemical – energy stored in chemical bonds of molecules Non-Gravitational Forms of Potential Energy 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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