Sheer Coincidence

When I was a student of Engineering learning the basics I always used to wonder what 'Shear Force' could be An unbalanced vertical uncertainty at any support that threatens to shear up and cut down, inducing a fall I used to search for it in ceilings and even in fully rich ripened coconut trees- a Damocles Sword- it sounded to me more or less that way, those days The sword is always there omnipresent, ready to fall but, never it will strike as long as the 'Reactions' bearing it remains powerful- once the reactions get weak and give away the shear force slices up and cuts down We won't know There won't be any need to know it by that time Thoughts- Sheer coincidence only