A hooked spring scale will be suspended to measure force. To measure tensile strength, attach a spring scale to the sample. Pull down at a constant rate until the sample wrap breaks. This will give a relative value for tensile strength. Repeat the procedure for each type of food wrap.
Elongation Use the assembled ring stands with a crossbar from the tensile strength procedure above.
Attach a second piece of duct tape at the base of each sample and pierce a small hole in the tape. A hooked spring scale is suspended to measure force. To measure elongation, attach a spring scale to a sample and vertically pull down at a constant rate. See figure below. Determine the slope of the graph to get a relative measure for the elongation of each type of food wrap.