Question about moments and torques. I understand that torque is defined as τ=Fs and understand where this comes from mathematically but am wondering why does nature make it easier to put a greater torque on an bolt with a longer lever. The only real explanation I can think of is by increasing the length of the arm, you are increasing the radius of the turning circle (of your lever arm). By doing this you are increasing the distance moved of your hand (circumference of circle) and so increasing the work done (W=Fs) and so more "energy" goes into turning the bolt with a longer arm? Thanks!