Task 2: Make a dynamometer for measuring the press. 

Workshop


Fill the PET bottle with water to the brim, add a few cut-off match heads (with a shank length of approx. 1 mm) and close the bottle. The more bottle you press, the more matches will sink. This press force measurement device operates on the principle of changing the density of a match caused by water pushed into its stick. Primary school pupils do not know the term “density“, so we say: „We push a little water into the stick of the match, and thus we increase the weight of the match.“