Fluid
This activity belongs to the GeoGebra book GeoGebra Principia.
By masking the polygon or the polyline with curves, for example using splines 
, we smooth the perception of the effect of the sum of internal forces (which preserve the distance of the points) with external forces (which apply a movement to the ensemble).
, we smooth the perception of the effect of the sum of internal forces (which preserve the distance of the points) with external forces (which apply a movement to the ensemble).Author of the construction of GeoGebra: Rafael Losada.