Question

One end of string of length $l$ is connected to a particle of mass '$m$' and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed '$v$', the net force on the particle (directed towards center) will be ($T$ represents the tension in the string)

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

Answer 1

Answer: (C)

$N=mg$ & $T=\frac{m{v}^2}{r}$

Hence the resultant force is T. inwords