The variation with extension x of the force F for a spring A is shown in fig 9.10. The point L on the graph is the elastic limit of the spring. iii. Describe the meaning of elastic limit iv. Calculate the spring constant kA for the spring A. v. Calculate the work done in extending the spring with a force of 6.4 N (b) A second spring B of spring constant 2kA is now joined to spring A as shown on fig 9.11. A force of 6.4 N extends the combination of the springs for the combination of the springs, calculate, i the total extension ii the spring constant
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Young modulus (E) is defined as the ratio of stress / strain.)
E = stress/strain
(b)
(i)
1. diameter / cross sectional area / radius
2. original length
(ii)
The original length can be measured with a metre ruler / tape
The diameter can be measured with a micrometer (screw gauge)
(iii)
Energy = ½ Fe or area under graph or ½ kx2
Energy = ½ (3)(0.25x10-3) = 3.8x10-4J
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