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JAMB Physics 2002 Question 4

Question 4

Elasticity

The diagram above shows the force-extension curve of a piece of wire. The energy stored when the wire is stretched from E to F is

Diagram for this question
  1. A.1.5 × 10−2 J
  2. B.7.5 × 10−1 J
  3. C.7.5 × 10−3 J
  4. D.2.5 × 10−3 J
Show the answer and explanation

Answer: C (7.5 × 10−3 J)

Explanation

Energy = area under the graph from E (0.05 m, 0.1 N) to F (0.10 m, 0.2 N) = ½(0.1 + 0.2) × 0.05 = 7.5 × 10−3 J.