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Design III Friction Exp

# Design III Friction Exp - Angle(Radians...

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Trial Aluminum 1 Block Thin Angle (Radians)* Coeff. Of Static Friction** Height Lifted (inches) 1 6 0.16 0.16 2 5.88 0.16 0.15 3 7.75 0.21 0.2 4 7.63 0.2 0.2 5 6.38 0.17 0.17 6 6.5 0.17 0.17 7 7 3/4 0.21 0.2 8 9 0.24 0.24 Avg Height: 7.11 Avg Coefficient: 0.19 Plastic 1 Block Thin Angle(Radians)* Coeff. Of Static Friction** Height Lifted(inch) 1 8.38 0.22 0.22 2 7.75 0.21 0.2 3 7.75 0.21 0.2 4 7 0.19 0.18 5 8.13 0.22 0.21 6 9.5 0.25 0.25 7 8 0.21 0.21 8 8.13 0.22 0.21 Avg Height: 8.08 Avg Coefficient: 0.21 Aluminum 1 Block Wide  Angle (Radians)* Coeff. Of Static Friction** Height Lifted (inch) 1 8.25 0.22 0.22 2 8 1/2 0.23 0.22 3 8.25 0.22 0.22 4 9.5 0.25 0.25 5 8.25 0.22 0.22 6 8.5 0.23 0.22 7 8.5 0.23 0.22 8 8 1/8 0.22 0.21 Avg Height: 8.48 Avg Coefficient: 0.22 Formulas * sin(angle) = height lifted/guide rail length *angle = sin^(-1)(height lifted/ guide rail length) **coeff of static friction = sin(angle) ***std deviation =SQRT((1/7)*(((c1-c)^2)+((c2-c)^2)+((c3-c)^2)+((c4-c)^2)+((c5-c)^2)+(

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+((c7-c)^2)+((c8-c)^2))) Note: For standard deviation, c# = coefficient for trial #, and c = avg coeff for the 8 trial Plastic 1 Block Wide Angle (Radians)* Coeff. Of Static Friction**
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Design III Friction Exp - Angle(Radians...

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