1) What is represented by the arrows labeled N, D, and F?
N= Surface Perpendicular Component
D= Surface Parallel Component
F= Friction
2) Start with dry soil (friction coefficient = 0.5u), a rock with mass of 100g at an
angle = 0. What is the value of N, D, and F? (You may need to toggle the angle from
zero to some value and then back to zero to reset the module.)
F= 50
D= 0
N= 100
3) What are the values of N, D, and F when the angle is 26º? And 27º, and 45º?
26º
F= 44.95
D= 43.85
N= 89.9
27º
F= 44.6
D= 45.4
N= 89.15
45º
F= 35.4
D= 70.75
N= 70.75
4) Describe how D changes as the slope angle increases. At what angle does the rock
begin to slide? This is defined as the Failure angle.
D gets larger as the angle gets larger.
The rock begins to slide at 26.7 º.
5) Complete the following table for 100g of each rock type listed. Create an XY
scatter plot (without lines connecting data points) of Failure Angle vs. Friction
Coefficient.
Produce a trend line including the formula to fit the data – use the ‘Chart’ menu
and select ‘add trend line’ choice. Write the equation and discuss how failure angle
changes as a function of frictional coefficient (look at the equation and the graph)?
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 Fall '07
 Stewart
 Erosion, Friction, Appalachian Mountains, mountain range, Allegany mountains

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