Concept
Moment centre
2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
Answering one question without solving the rest
A truss of fifty members can be interrogated about one of them. Cut through three, take moments about the point where two of them meet, and the third falls out in a single line.
The equation that is not new, and the three that are
A plane free body yields exactly three independent equations. Most attempts at a fourth are one of the first three wearing different clothes — and on a beam under vertical load, one of the three is already saying nothing.
Named alongside it
The objects these essays reach for when they reach for this one.
Free body diagramMoment equilibriumChord forceDeterminacyForce equilibriumIndependent equationsLever armLine of actionMethod of sectionsPanel shearRigid body