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10.1 Energy and Work

Energy and WorkVocabulary work (p. 258) Energy (p. 258) kinetic Energy (p. 258) work - Energy theorem (p. 258) joule (p. 259) power (p. 263) watt (p. 263) MachinesVocabulary machine (p. 266) effort force (p. 266) resistance force (p. 266) mechanical advantage (p. 266) ideal mechanical advantage (p. 267) efficiency (p. 268) compound machine (p. 269)Key Concepts work is the transfer of Energy by mechanical means. A moving object has kinetic Energy . The work done on a system is equal to the change in Energy of the system. work is the product of the force exerted on an object and the distance theobject moves in the direction of the force. The work done can be determined by calculating the area under a force-displacement graph. Power is the rate of doing work , that is the rate at which Energy is transferred. P Wt W Fdcos W KEKE 12 mv2W FdKey Concepts Machines, whether powered by engines or humans, do not change theamount of work done, but they do make the task easier.

John pushes a crate across the floor of a factory with a horizontal force. The roughness of the floor changes, and John must exert a force of 20 N for 5 m, then 35 N for 12 m, and then 10 N for 8 m. a. Draw a graph of force as a function of distance. b. Find the work John does pushing the crate.

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