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# ps4c11 - Physics 111.01 PS 4c(11 Problem 1 Static and...

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Physics 111.01 September 26, 2008 PS 4c (11) Problem 1. Static and Kinetic Friction on an incline: A 10 kg crate is placed at rest on an incline plane ( s = 0.7 , k = 0.5 ), whose angle can be adjusted. a.) The maximum angle of the incline for which the crate will stay at rest is: b.)-e.) If the angle of the incline were instead the two amounts shown below, please fill in the rest of the values on the chart below: angle of incline: component of weight acting along incline: (size only) friction force: (size only) (indicate static or kinetic): net force on crate: (size only) acceleration of crate: (size only) 15 o N N, N m/s 2 65 o N N, N m/s 2 f.) For the 65 o angle, find how long it would take the crate to slide down 5 m along the incline. g.) Explain why it is NOT possible for an object which is placed at rest on an inclined plane to then start sliding down with constant speed. m 10 kg θ x y mg=98 N θ N mg cos θ mg sin θ f g

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