Energy, Work, and - Mr. Nguyen's Website

Physics: Principles and ProblemsSolutions Manual225 Copyright Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, , work , and Simple MachinesCHAPTERP ractice and Workpages 257 265page to Example Problem 1 to solve thefollowing the hockey player exerted twice asmuch force, N, on the puck, howwould the puck s change in kinetic energy be affected? Because W!Fdand !KE!W,doubling the force would double the work , which would double thechange in kinetic energy to the player exerted a N-force, butthe stick was in contact with the puckfor only half the distance, m,what would be the change in kineticenergy? Because W!Fd,halving the distance would cut the work in half,which also would cut the change inkinetic energy in half, to , two students exert a force of 825 Nin pushing a car a distance of 35 much work do the students do onthe car?

6. An airplane passenger carries a 215-N suit-case up the stairs, a displacement of 4.20 m vertically, and 4.60 m horizontally. a. How much work does the passenger do? Since gravity acts vertically, only the vertical displacement needs to be considered. W! Fd! (215 N)(4.20 m) ! 903 J b. The same passenger carries the same suitcase back down the ...

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