For this question, you need to design and conduct an experiment. Consider the sellotape roll shown in the figure below. The objective is to determine the critical strain energy release rate, Gc, for the adhesive. This can be done by hanging a weight on a partly peeled length while supporting the roll so that it can freely rotate (e.g. hang it on a pencil). Increase the load to the value M that just causes rapid peeling (i.e. fast fracture). Measure and record the value of M. Also measure the width, w, of the adhesive. (a) As a first approximation, assume that the quantity of the strain energy is small compared to the work done by M and can be neglected. Formulate and calculate the critical strain energy release rate, Gc, for the adhesive. (b) Now assume that we take a more thorough approach and also consider the strain energy in the elastic tape. How would you calculate Go for this case? What other parameters would we have to measure to calculate the value of Gc ? Sellotape roll |-8a-1- da M M