101.F07.lecture8.multi

101.F07.lecture8.multi - PHY101: The power of conservation...

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Unformatted text preview: PHY101: The power of conservation laws? http://johnfenzel.typepad.com/john- fenzels- blog/images/2007/03/29/safety- net- cartoon.jp Work and kinetic energy Work has a simple relation to the change in kinetic energy: W total = W cons + W nc = K , or the work done by all the forces on an object is equal to the change in kinetic energy of the object. W cons and W nc denote work done by conserved forces and work done by nonconserved forces respectively. What about potential energy, U , and work? Lets define: U =- W cons , then W nc = U + K. Nonconservative work and friction Suppose a block is released from rest at the top of a ramp and allowed to slide down. How fast will it be going when it reaches the bottom in the presence of kinetic friction? The maximum height of the ramp is h , the angle of the ramp is , and the kinetic friction coefficient is k . Nonconservative work and friction Suppose a block is released from rest at the top of a ramp and allowed to slide down. How fast will it be going when it reaches the bottom in the presence of kinetic friction? The maximum height of the ramp is...
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101.F07.lecture8.multi - PHY101: The power of conservation...

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