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STD 11 - 6. system of particles and rotational motion — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 6. system of particles and rotational motion4 Marks
Question
A long horizontal rod has a bead which can slide along its length, and initially placed at a distance $L$ from one end $A$ of the rod. The rod is set in angular motion about $A$ with constant angular acceleration $\alpha$. If the coefficient of friction between the rod and the bead is $\mu$, and gravity is neglected, then the time after which the bead starts slipping is
✓

Answer

(a) Let the bead starts slipping after time$ t$

For critical condition

Frictional force provides the centripetal force

$m{\omega ^2}L = \mu \,R = \mu \,m \times {a_t} = \mu Lm\alpha $

$⇒$ $m{(\alpha t)^2}L = \mu mL\alpha $ $⇒$ $t = \sqrt {\frac{\mu }{\alpha }} $      (As $\omega = \alpha t$)

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