Laws of Motion - Result Question 21

21. 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 centre) will be ( T represents the tension in the string) :

[2017]

(a) T+mv2l

(b) T−mv2l

(c) Zero

(d) T

Show Answer

Answer:

Correct Answer: 21. (d)

Solution:

  1. (d) Net force on particle in uniform circular motion is centripetal force (mv2ℓ) which is provided by tension in string so the net force will be equal to tension i.e., T.
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