A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?
ANSWER: Option C
EXPLANATION: Using the equation
Strain = ∆L/L
Where; ∆L —> change in length
L —> Original Length
If L1 is the original length and L2 is the length after the exertion of force, then
∆L = L2 – L1
In this case, ∆L is 6mm.
Change 6mm to cm by dividing it by 10, then insert into the formula to arrive at your answer.
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