Question

which component of force does not contribute towards torque

Answer 1

By definition of the torque, the cross product of the displacement to the point where a force is applied, r, and the force itself, F,τ=r×Fit must be that that component of the force F that is parallel to r plays no role. The only part which is non-zero is the part perpendicular to r.

Answer 2

hellooo

We know that
τ⃗ =r⃗ ×F⃗ ⇒τ=rF sinθ
Therefore, Force, F having component parallel to r will not contribute to torque because in that case sin θ=sin 0^0 =0