1008_chap15

1008_chap15 - ME240...

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ME 240 Potential Energy and Conservative Forces (15.3) HW: 15.88, 15.133 Supplemental Problems: 15.94, 15.140
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Potential Energy Potential energy: work done an a system which is stored and available to do work Work done by conservative forces can be expressed as potential energy Path independent constant force spring force p Function of position only Work performed between point r 1 to r 2 can be calculated with knowledge f the end oint positions alone gravitational force of the end point positions alone Work done by dissipative forces can NOT be expressed as potential energy Coulomb friction force Viscous friction force
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Conservation of Energy 11 2 2 TU T  inetic energy: recall relationship between kinetic energy and work Kinetic energy: 2 1 2 Tm v V VU conservative forces non conservative forces   12 1 2 12 nc UV 2 1 2 e Vk s m g h (linear spring) ravity)  2 12 r nc UF d r g Vm (gravity) 1 r
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1008_chap15 - ME240...

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