Chapter Five Notes

# Chapter Five Notes - Chapter Five Energy I Work...

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Chapter Five: Energy I) Work: displacement of an object due to an applied force A) W = F Δ x B) Scalar quantity C) Measured in Newton-meter or Joule D) The force can be split into two components, but only the component parallel to  the direction of displacement does work on the object W = (Fcos ) Δ x Θ E) Always requires a system of more than just one object 1) In general, an object may be moving under the influence of several external  forces 2) Total work done on the object as it undergoes some displacement is the sum  of the amount of work done by each force F) Can be positive or negative, depends on the  direction of the force relative to the  direction of the displacement G) Frictional work 1) Friction is complex process caused by numerous microscopic interactions  over the entire area of the surfaces in contact 2) Always dissipates energy  II) Two general kinds of forces A) Conservative forces: no energy is dissipated 1) Example:  gravity 2) A force is conservative if the work it does moving an object between two  points is the same no matter what path it has 3) Work they do can be recast as potential energy B) Nonconservative forces: generally dissipative 1) Tends to randomly disperse the energy of bodies on which it acts

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• Spring '08
• smith

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