788 Work and Energy 6 Geometrical Representation of Work: The work done by a force Cost equals the area under the F versus r curve 变力曲线 与位移轴在极限x,x2之间所包围ord7B 的面积 Example 7-5 and 7-67&8 Work and Energy 6 Geometrical Representation of Work: The work done by a force equals the area under the F versus x curve —— 变力曲线 与位移轴在极限x1, x2 之间所包围 的面积. Fcos A r B dr r r o Example 7-5 and 7-6