This force is so weak that it can only be observed when the electric and color forces are not interacting

The weak force is the only force which can change flavors ; it can turn a quark or lepton into a different kind of quark or lepton .

It's the only force by which neutrinos are affected. (Neutrinos hardly feel the gravitational force because their mass is so tiny.)

Its exchange particles are the W-, the W+, and the electrically neutral Z.

About Weak Force in German. (Schwache Kraft)