Equilibrium in a single plane, statically determinate system (SE110.53)

Equilibrium in a single plane, statically determinate system (SE110.53)

equilibrium conditions and support reactions of a leaning ladder



  • The principle of “freeing” in engineering mechanics allows forces and moments acting on a body to be made visible.
  • In this process, a body or a system such as a bar are virtually removed from the environment.
  • All forces acting on the body or on the system are replaced by standardised symbols.
  • This results in a simplified model of the body or system, which clearly demonstrates the relationships between forces and moments.
  • In the experiment SE 110.53, we demonstrate the principle of “freeing”, which refers to establishing static equilibrium.
  • The experiment uses a model of a ladder with a sliding clamp weight.
  • The top support is designed as a movable support and the bottom one as a fixed support.
  • The real effective support forces can be fully compensated by applying cable forces in the x and y directions.
  • The ladder is in a state of equilibrium without changing the angular position and without the need for structural support.
  • The ladder is “free”.
  • For students, the result is a convincing example for the principle of “freeing” in statics.
  • The parts of the experiment are clearly laid out and securely housed in a storage system.
  • The entire experimental setup is constructed in the SE 112mounting frame.

Learning Objective/Experiments:

  • experimental development of the core principle of “freeing” in statics
  • calculation of the support forces for a given position of the clamp weight and for a known angle of inclination
  • application of the 1st and 2nd equilibrium conditions in statics and full compensation of the support forces by cable forces
  • how does the clamp weight position affect the support forces?
  • how the angle of inclination affects the support forces

Scope of delivery:

  • 1 model of a ladder
  • 2 supports
  • 3 guide pulleys
  • 1 set of weights
  • 1 clamp weight
  • 3 cables
  • 1 tape measure
  • 1 storage system with foam inlay
  • 1 set of instructional material


Required: SE 112 Mounting frame


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