Unformatted text preview: m . The step has height y with y ≤ R . A force F app is applied horizontally to the roller at height R to try to push the roller over the step. A line drawn through the applied force passes the roller’s center of mass. ²ind the expression for F app that just marginally lifts the roller. This is a static equilibrium situation where the normal force of the ground has just gone to zero, but the roller is still marginally touching the ground. What are the F app values for y = 0 and y = R ? HINTS: Draw a good diagram, use geometry, and identify the best pivot point for a torque calculation....
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 Fall '11
 Dr.Acost
 Physics, Statics, Force, Mass, 20 M, Fapp

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