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23-conservation of Energy 2

# 23-conservation of Energy 2 - Phys 211 Chapter 8...

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Phys 211 3/20/09 Chapter 8 Conservation of Energy Chapter 9 Systems Center of Mass Linear Momentum

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Review Δ U = W Potential - Energy of Arrangement of objects of a system Δ K = W = F d Kinetic - Energy of motion of objects of a system Δ U ( x ) = W = F ( x ) Δ x F ( x ) = Δ U ( x ) Δ x → − dU ( x ) dx Δ K = −Δ U K f K i = ( U f U i ) K f + U f = K i + U i conservative forces cause energy transfer within isolated system Energy Conservation
Ice Falling After an ice storm, ice falls from one of the top floors of a 65-story building. The ice falls freely under the influence of gravity. Which one of the following statements concerning this situation is true? Ignore any effects due to non-conservative forces. a) The kinetic energy of the ice increases by equal amounts for equal distances. b) The kinetic energy of the ice increases by equal amounts for equal times. c) The potential energy of the ices decreases by equal amounts for equal times. d) The total energy of the block increases by equal amounts over equal distances. e) As the block falls, the net work done by all of the forces acting on the ice is zero joules.

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