Shear Force and Bending Moment Diagrams: This website is useful because it explains point loads and point moments. It also explains step by step equilibrium moments and forces, and it gives you a brief example of them and how to derive/draw shear forces and bending moment diagrams.
Shear Force and Bending Moment Diagrams: This is a good website, provides a great deal of explanation for the formulation of equations. Displays the diagrams that correspond to the different loads and forces; this allows you to select the most appropriate equation. It also explains shearing force and bending moments.
A triquetral fracture is carpal bone fracture that generally occurs on the dorsal surface of the triquetrum. It may be fractured by means of impingement from the ulnar styloid, shear forces, or avulsion from strong ligamentous attachments. On plain film, dorsal avulsion injuries are best detected on a lateral projection. http://radiopaedia.org/articles/triquetral-fracture
A Smilodon skull looks very different from that of a modern big cat. Sabercats are fundamentally different from feline (modern) cats. Instead of having a strong bite force, they have the capacity to deliver a slashing, shearing force with their saber-like teeth. They were probably adapted to rip the prey’s throat out with one slice, or possibly to eviscerate smaller to medium sized prey.