Question

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 : (T is the tension in the string)

• A. T
• B. $T-\frac{mv^2}{1}$
• C. $T+\frac{mv^2}{1}$
• D. 0

Answer 1

Answer: (A)

T

Answer 2

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 $T$. $\left(T=\left( mv ^{2}\right) / I \right)$