Question

When forces F₁, F₂, F₃ are acting on a particle of mass m such that F₂ and F₃ are mutually perpendicular, then the particle remains stationary. If the force F₁ is now removed than the acceleration of the particle is 

(A) (F₁ / m) 

(B) (F₁F₂ / m) 

(C) [(F₂ – F₃) / m] 

(D) (F₂ / m)

Answer 1

Correct option: (A) (F₁ / m)

Explanation:

F₂ and F₃ are perpendiculars.

To keep particle
stationary.

|F₂ + F₃| = |F₁|

i.e. |F₁| is magnitude of resultant of F₂ and F₃.

hence when F₁ is removed,

a = (F₁ / m)