WAEC Physics 2021 Theory — Question 1
Question 1 of 35 from the West African Examinations Council (WAEC) Physics 2021 Theory paper, with the correct answer and a full explanation.
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1. The load-extension graph of an elastic material is illustrated below (Load/N vs Extension/cm, a straight line through the origin to about (1.0, 4.0)). Use the graph to determine the work done in stretching the material.
Model answer
Work done = area under the load-extension graph (a triangle) = ½×base×height = ½×(1.0×10⁻²m)×4.0N = 2×10⁻² J.
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