Engineering
Physics
Work Done by a Variable Force
Equilibrium
Stress Strain and Hookes Law New
Question
The force (F) - extension (e) graph of figure shows that the work done by external agent in slowly streching the material under test for an extension of 4 m is greater than
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Solution
The work done stretching a material equals the area under the force-extension graph. The graph shows a straight line from (0,0) to (4,4) and a curve above it. The work done for 4m extension is the area under the given curve.
This area is greater than the area under the straight line, which represents the work for a linear (Hooke's law) material: .
Final Answer: 8 J