Forces in a crane jib (TM 115)

Forces in a crane jib (TM 115)

vectoral handling of forces in a planar central force system



  • TM 115represents a planar central force system in which multiple forces act on a single point of application.
  • Based on the example of a crane jib, forces are determined graphically and experimentally: resultant cable force, tensile force, compressive force.
  • The directions and magnitudes of the forces are determined graphically by way of a force parallelogram.
  • A bar of adjustable length and a chain make up the crane jib, which is attached by adjustable clamp elements to a retaining bar.
  • Weights are applied to the crane jib.
  • The occurring bar forces are indicated by integrated spring balances.

Learning Objective/Experiments:

  • graphical breakdown of forces by force parallelogram
  • determination of the bar forces on various jib forms
  • comparison of: measuring result – calculation – graphical method

Scope of delivery:

  • 1 experimental unit
  • 2 spring balances
  • 1 set of weights
  • 1 storage system with foam inlay
  • 1 set of instructional material


Optional: WP 300.09 Laboratory trolley


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