Physics 163

Unit 5: Work, Energy and Power

Problem Set A

Problem 4:

Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of 27.9 Newtons at an angle of 45 degrees to drag his backpack a horizontal distance of 179.2 meters to the right. Determine the work (in Joules) done upon the backpack.

• Read the problem carefully and diagram the physical situation
• Identify known and unknown information in an organized manner
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Work, energy and power concepts can be reviewed on the Set A Overview page.

Further information about the concept of and equation for work is available online at The Physics Classroom.

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