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3-2.Motion in Plane
medium
One end of a string of length $l$ is connected to a particle of mass $m$ and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed $v$ the net force on the particle (directed towards the centre) is :
$(i) \;T,$ $(ii)\; T-\frac{m v^{2}}{l},$ $(iii)\;T+\frac{m v^{2}}{l},$ $(iv) \;0$
$T$ is the tension in the string. [Choose the correct alternative].
Option A
Option B
Option C
Option D
Solution
$(i)$ $T$ When a particle connected to a string revolves in a circular path around a centre, the centripetal force is provided by the tension produced in the string. Hence, in the given case, the net force on the particle is the tension $T$, i.e.,
$F=T=\frac{m v^{2}}{l}$
Where $F$ is the net force acting on the particle.
$F=T=\frac{m v^{2}}{l}$
Where $F$ is the net force acting on the particle.
Standard 11
Physics
