Problem 2.52 - Problem 2.52 [Difficulty: 3] Given: Block...

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Problem 2.52 [Difficulty: 3] Given: Block sliding on oil layer Find: Direction of friction on bottom of block and on plate; expression for speed U versus time; time required to lose 95% of initial speed F v x U y h Solution: Governing equations: τ yx μ du dy = Σ F x Ma x = Assumptions: Laminar flow; linear velocity profile in oil layer The bottom of the block is a -y surface, so τ yx acts to the left; The plate is a +y surface, so τ yx acts to the right Equation of motion Σ F x x = so F v M dU dt = The friction force is
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