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27ConservationOfEnergy

27ConservationOfEnergy - 27 Conservation of Energy K f U f...

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27 Conservation of Energy scenarios: push a block across a table at constant speed a block slides to a halt pick up a block, and place it on a ledge toss a block upwards toss free-fall K f U f  E th = K i U i W ext what's the system? (A) + (B) - (C) 0 D K=? D U=? W diss = ? W ext = ? energy transformations? within system energy transfers? in/out of system
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Problem-Solving Strategy 11.1 Solving energy problems Model Identify which objects are part of the system and which are in the environment. If possible, choose a system without friction or other dissipative forces. Some problems may need to be subdivided into two or more parts. Visualize Draw a before-and-after pictorial representation and an energy bar chart. A free-body diagram can be helpful if you’re going to calculate work, although often the forces are simple enough to show on the pictorial representation. Solve If the system is both isolated and non-dissipative, then the mechanical energy is conserved:
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