question_answer 4)

One end of a string of length I 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,                                      (b) (c)                       (d) 0. T is the tension in the string. Choose the correct alternative.  

Answer:

Alternative (i) is correct. The net force on the particle directed towards the centre is T. This provides the necessary centripetal force to the particle moving in the circle.