Mohr Circle
View vectors in 3D. If the applet doesnt load,
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User’s Guide 
where and which is the equation of a circle
σ _{ x}
_{1} τ _{ x}
_{1} _{y} _{1}
as the coordinates. The
circle has radius R, and its center has 
Various inputs can be given using sliders on this panel. The negative values shows the compression of the corresponding plane. Outputs values can be viewed in the panel and the corresponding points on the Mohr Circle are ColorCoded. 
View can be set from this panel. Zoom, translate and highlighting the Mohr Circle/ Free Body Diagram can be controlled through this panel. 
This is a sample
screen in which 

This is a sample screen in which Free Body Diagram is highlighted. We can see the negative value (Compression) of Normal Stress in ydirection is represented with arrows pointing inside in the Free Body Diagram. 