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Understanding the Moment Arm in Cantilevers

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Figures (3)

Shear and moment diagram for a simply supported beam with a concentrated load at mid-span.
Computing the moment of force in a beam.
Computing the bending moment in a beam.

Key Points

  • A bending moment is a moment of force, and is usually expressed as acting relative to the neutral axis of the element's cross section.
  • A cantilever in a traditionally timber framed building is called a jetty or forebay.
  • The compression is done reversibly (very slowly), but non-adiabatically: the air receives heat through the walls throughout the process.
  • The efficiency of the Carnot engine cycle (7/6) is only reached if the turbine and compressor operate isentropically.
  • A bending moment is dimensionally equivalent to torque; it is a force multiplied by a distance so is typically expressed in units of Newton-metres (N·m), or the pound-foot (lb·ft).

Terms

Tap a term for a plain-language explanation.

Sources & licensing(4)