Unit 5: Work, Energy and Power
Problem Set C
A car is moving across a level highway with a speed of 32.1 m/s. The brakes are applied and the wheels become locked as the 1124-kg car skids to a stop. The braking distance is 122.4 meters. Determine the braking force (in Newtons) acting upon the car.
0.5 m vi2 + m g h i + F d cos = 0.5 m vf2 + m g h f
General information about work and energy problems is described on the Set C Overview page.
A detailed discussion of how to analyze physical situations using work-energy bar charts is provided online at The Physics Classroom.
A detailed description of the work-energy relationships for situation in which external forces are doing work is provided online at The Physics Classroom.
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