Which loading cases and material properties are probably in key role when designing the following machine components?

$\backslash$table$[[\backslash$table$[[$Machine$],[$component$]],\backslash$table$[[$The most probable$],[$loading case$]],$Critical material property$],[\backslash$table$[[$A single ball in ball$],[$bearings$]],,],[\backslash$table$[[$Power$],[$transmission shaft$]],,],[\backslash$table$[[$A helical damping$],[$spring of a$],[$suspension system$],[$in cars$]],,],[$Gear $($wheel$),,],[\backslash$table$[[$Steel beam in a$],[$bridge construction$]],,]]$