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

• A. $T+\frac{m{v}^2}{l}$
• B. $T-\frac{m{v}^2}{l}$
• C. Zero
• D. $T$

Answer 1

The correct option is D $T$

Net force on the particle in uniform circular motion is centripetal force, which is provided by the tension in string.
so, $F_c=T$