Can Torque Be Zero?

An applied force can result in zero torque if there is no lever arm or the applied force is parallel to the lever arm (see Figure 3 and 4 below).

What happens when torque is zero?

If the net torque on a rotatable object is zero then it will be in rotational equilibrium and not able to acquire angular acceleration.

Can torque be 0 when force is nonzero?

According to Newton's third law, the sum of all the internal torques is zero. For an object to be in mechanical equilibrium, the net external force and the net external torque acting on the object have to be zero. F_tot = 0, τ_tot = 0. The total torque can be nonzero, even though F_tot = 0.