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Question
A mass of 2 kg is suspended with thread AB (Figure). Thread CD of the same type is attached to the other end of 2 kg mass. Lower thread is pulled gradually, harder and harder in the downward directon so as to apply force on AB. Which of the threads will break and why?
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Solution
The thread AB will break earlier than the thread CD. This is because forces acting on thread CD = applied force and force acting on thread AB = (applied force + weight of 2 kg mass). Hence, the force acting on thread AB is larger than the force acting on thread CD.
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