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22-conservation of energy

# 22-conservation of energy - Phys 211 Chapter 8 Potential...

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Phys 211 3/18/09 Chapter 8 Potential Energy Conservation of Energy

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Review Δ U = W Work transfers energy - sign indicates direction of transfer The work done by a conservative force on a particle moving between two points does not depend on the path taken by the particle Gravity U U i = mg ( y y i ) U 0 = 1 2 kx 2 0 Spring Potential - Energy of Arrangement of objects of a system Δ K = W = F d Kinetic - Energy of motion of objects of a system
Work and Energy A donkey pulls a crate up a rough , inclined plane at constant speed . Which one of the following statements concerning this situation is false? a) The gravitational potential energy of the crate is increasing. b) The net work done by all the forces acting on the crate is zero joules. c) The work done on the crate by the normal force of the plane is zero joules. d) The donkey does "positive" work in pulling the crate up the incline. e) The work done on the object by gravity is zero joules.

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Potential Energy Graphs Δ U ( x ) = W = F ( x ) Δ x F ( x ) =
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