Doug Richie, Jr., DPM, FACFAS, FAAPSM, wrote an excellent article in the June, 2010 issue of Podiatry Today entitled: How to Manage Friction Blisters. The article provides an overview of friction blister pathomechanics, misconceptions about friction blisters, shoe fit, insoles, and socks, and blister treatment tips. The article also explains how shear forces contribute to blister formation by causing the top three layers of the epidermis to separate from the stratum spinosum.
How does the weight of the block affect friction? | Weight Loss Guide
One of our engineering experts says this: in theory the weight of the block does not matter. However, when working with soft materials such as foams, weight does matter. I hope that helps.