AIPMT | 2015Work, Power and EnergyHard
Question
Two similar springs P and Q have spring constants KP and KQ, such that KP > KQ. The are stretched, first by the same amount (case a,) then by the same force (case b). The work done by the springs WP and WQ are related as, in case (a) and case (b), respectively :
Options
A.WP = WQ ; WP = WQ
B.WP > WQ ; WQ > WP
C.WP < WQ ; WQ < WP
D.WP = WQ ; WP > WQ
Solution
Given KP > KQ
Case (a) : x1 = x2 = x
⇒ WP > WQ
Case (b) : F1 = F2 = F
For constant force
W =
So
⇒ WQ > WP
Hence option (2)
Case (a) : x1 = x2 = x
⇒ WP > WQCase (b) : F1 = F2 = F
For constant force
W =
So
⇒ WQ > WPHence option (2)
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