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:
(i) T, (ii) T - mv2 / l, (iii) T + mv2 / l, (iv) 0
T is the tension in the string.
[Choose the correct alternative]. ​

Answer 1

Explanation:

(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 = mv2 / l

Where F is the net force acting on the particle.

Answer 2

$\huge{Answer\:=\:T}$

_______________________________

Explanation :

☑️ 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 = mv2 / l

Where F is the net force acting on the particle.