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Circular Motion Problem

A rod of length L is pivoted at one end & rotated with a uniform angular velocity in a horizontal plane. Let \(T_{1}\) & \(T_{2}\) be the tensions at points L/4 & 3L/4 respectively away from pivoted ends. Then

(a) \(T_{1}\) > \(T_{2}\)

(b) \(T_{1}\) = \(T_{2}\)

(c) \(T_{1}\) < \(T_{2}\)

(d) Relation between \(T_{1}\) & \(T_{2}\) depends on whether the rod rotates clockwise or anticlockwise

Note by Nishant Sharma
4 years, 6 months ago

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6 votes

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The tension at L/4 \(=\frac{3}{4}M\omega^2[\frac{1}{2}\frac{3}{4}L]\). The tension at 3L/4 \(=\frac{1}{4}M\omega^2[\frac{1}{2}\frac{1}{4}L]\). Therefore \(T_1 > T_2\).

Shubham Srivastava - 4 years, 6 months ago

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http://www.askiitians.com/forums/Mechanics/10/5212/circular-motion.htm

Anuraag Reddy - 2 months, 3 weeks ago

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C) t1 <t2

Mohit Jain - 3 years ago

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\(a\) is correct...:)

Advitiya Brijesh - 4 years, 6 months ago

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I 'll go with (a) :D

Lokesh Sharma - 4 years, 6 months ago

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Hey, please show me the thinking or the concept.

Nishant Sharma - 4 years, 6 months ago

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Tension must acount for the centripital acceleration for both the cases. That's all I used with a bit of calculation to compute the centripital acceleration and mass. Am I correct?

Lokesh Sharma - 4 years, 6 months ago

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@Lokesh Sharma i think your concept of creating tension in the rod becuase of centripetal accelaration is right and i think this is the key of this problem and we don't have to take it into consideration whether the rod is rotating clockwise or anticlockwise because for both of the two cases as the rod is rotating in horizontal plane would create same centripetal accleration at same distance........please let me know if furthermore anything should be thought of....

Raja Metronetizen - 4 years, 6 months ago

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Consider the portion of the rod between L/4 and 3L/4. T1 acts on that portion in a radially inward direction. T2 acts on that portion in a radially outward direction. The net force on that portion must be radially inward. Therefore, T1 > T2.

Ramon Vicente Marquez - 4 years, 6 months ago

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You may be correct. But how far I know tension in a segment of rod always acts towards the mid-point of that section. Anyways can you give me a mathematical solution to this problem ? Including the free-body diagram ?(if possible)

Nishant Sharma - 4 years, 6 months ago

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