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After brief introduction to landslides and slope stability maps, I prompt students to identify factors that control slope stability. I then explain force balance diagram and a slope stability equation I have modified for this audience: Critical shear stress = friction * [(weight stress*cos (slope angle))fluid stress] And discuss the physical properties encompassed by each of the terms. This in-class demonstration was designed to illustrate some of the physical properties encompassed in "friction" term. [I also go through many calculations and effects of changing terms on critical shearing stress.] Materials: 2 boards connected by door hinge Large rock (or brick) 50-grit (course) sandpaper (1 sheet) 1 sheet of overhead transparency String Portable white board or sheet of cardboard Marker Procedure Start with rock on board, raise board. When rock slides, stop raising board and trace slope of board on whiteboard/cardboard (see picture in supplementary materials). Discuss concept of maximum slope angle. Show students sandpaper, prompt for hypothesis on change in maximum slope angle. Tie sandpaper around rock (quick and easiest method), run experiment again. Repeat with transparency. Discuss difference in smoothness/material properties on maximum slope angle.
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