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prelab

# prelab - Name Section Date Physics 211 PreLab#4 Energy...

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© University of Illinois Physics 211 - PreLab 4 Page 1 of 4 Name _________________________________ Section _____________ Date ____________ Physics 211 PreLab #4: Energy Reading: Tipler Chapter 6 - “Work and Energy”; Chapter 7 - “Conservation of Energy” Conserve Your Energy in Lab In past labs and lectures you studied the dynamics of various physical systems by identifying the forces acting on the systems and then applying Newton’s laws. An alternative and in many cases easier approach to studying physical systems is to examine the energy of the system. The relationship between these two approaches can be examined by considering one-dimensional motion of a particle due to the application of a variable force, F(x). In this case, we think of the force as doing work on the object, where the work done moving the particle between points x A and x B , W AB , is related to the force on the particle, F(x), by the expression: W AB = F(x)dx x A x B (Eq. 1) For certain types of forces, known as conservative forces , the work done moving a particle between two points is related to the change in the particle’s potential energy , U, between these points, W AB = - U = U A - U B (Eq. 2) Conservative forces are those which do no net work when moving a particle along any closed path, i.e., W AA = 0. Examples of conservative forces include the gravitational force, F = mg, which has an associated potential energy, U grav = mg(h B -h A ),

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