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Unformatted text preview: The change in thermal energy of the block-floor system is equal to the work done by the friction between the block and floor. We get E th = -W f = k mgd = 23.52 J The thermal energy goes to the floor, or to the block. Hence the change in thermal energy of the floor is E th = E th,B + E th,F E th,B = E th - E th,F = 8.52 J b) During the displacement of 2.00 m, what is the increase in the kinetic energy of the block? According to the work-energy theorem, change in the kinetic energy of an object is equal to the work done by the net force exerted on the object. Only the applied horizontal force and friction do work on the block. The work-energy theorem yields K = W net = W F + W f = Fd - k mgd = 76.5 J...
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This note was uploaded on 12/10/2011 for the course PHY 2048 taught by Professor Field during the Spring '08 term at University of Florida.
- Spring '08