Features
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 standardized symbols.  This results in a simplified model of the body or system, which clearly demonstrates the relationships  between forces and moments.  

In the experiment with Tesca Equilibrium in a Single Plane Apparatus, 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 mounting frame.  

Specifications
Development of the static principle of “freeing” 
Full compensation of the support forces by cable forces  
Sliding clamp weight  
Determine the position of the clamp weight via steel rule with millimetre scale  5. 2 supports (1x fixed support, 1x movable support)  
3 guide pulleys  
Storage system for parts  
Experiment setup in the mounting frame  

Technical Specifications
Ladder  
       ?     Length: 650mm  
       ?     Weight: 2N  
       ?     Built-in rule, graduation: 1mm  
Clamp weight: 20N  
Weights  
       ?     3x 1N (hanger)  
       ?     9x 5N  
       ?     12x 1N  
Supports  
       ?     2, clamped to mounting frame  
Steel rule  
       ?     Length: 1000mm, graduation: 1mm  

Experiments

1. Experimental development of the core principle of “freeing” in statics 
2. Calculation of the support forces for a given position of the clamp weight and for a known  angle of inclination  
3. Application of the 1st and 2nd equilibrium conditions in statics and full compensation of the  support forces by cable forces  
4. How does the clamp weight position affect the support forces  
5. How the angle of inclination affects the support forces