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Class 15 - Friction Curved Paths Physics 1301 Fall 2011...

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1 Friction, Curved Paths Physics 1301, Fall 2011: Class 15 Wednesday, October 5, 2011 Technology in the Middle East, ME 1130 at 12:30 pm today
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2 Objectives: Wednesday, September 28 Friction Forces for curved paths
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3 Demonstrations 1g20.40 Cup and weights 1g20.45 Dropped slinky 1g20.80 Cart and elastic band 1g20.85 Acceleration and pendulum cart 1g20.90 Drop accelerometer
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Problem A steel block is at rest on a steel inclined plane. The angle of the plane above the horizontal is slowly increased until the block begins to slide. At what angle does this occur? 4
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Problem A steel block is at rest on a steel inclined plane. The angle of the plane above the horizontal is slowly increased until the block begins to slide. At what angle does this occur? 5 N mg cos θ = 0 F f mg sin θ = 0 F f = μ s N = μ s mg cos θ μ s mg cos θ mg sin θ = 0 tan θ = μ s θ = tan 1 μ s = tan 1 0.80 ( ) = 39 °
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Drag Model for drag (air resistance) is that it depends on cross-sectional area and velocity F drag = (1/4)Av 2
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