Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is
Correct answer: B. 0.250 J
- A. 0.125 J
- B. 0.250 J
- C. 0.50 J
- D. 1 J
Explanation
For a linearly stretched wire, the stored elastic energy is the area under the force-extension graph: E = 1/2 F x = 1/2 x 100 N x 0.005 m = 0.250 J. The likely mistake is choosing 0.50 J by using F x instead of the triangular area 1/2 F x, which accounts for the force increasing from zero.
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Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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