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PHY221 Ch9: Work and PE

PHY221 Ch9: Work and PE. Recall main points: W non -conservative =  E mechanical Force from potential energy: Discussion and examples Foundation: work energy theorem: W = K Example of use of both energy and NII: Rollercoaster. PHY221 Ch9: Work and PE. Main Points.

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PHY221 Ch9: Work and PE

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  1. PHY221 Ch9: Work and PE • Recall main points: • Wnon-conservative=Emechanical • Force from potential energy: • Discussion and examples • Foundation: work energy theorem: W=K • Example of use of both energy and NII: Rollercoaster

  2. PHY221 Ch9: Work and PE Main Points • Wnon-conservative=Emechanical Proof: • Force from PE : Proof:

  3. PHY221 Ch9: Work and PE Discuss Problem: Start at top (y=h) at v =0. Loop-the-loop of radius R from ground; find max R for not falling off car w/out seatbelt. Problem: Block down frictionless incline of height h into surface with kinetic friction mk. Distance d to stop block.

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