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Lecture28-review

Lecture28-review - Lecture 28 Review(Sample problem solving...

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Lecture 28 Review (Sample problem solving) 1 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010
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Sample problem 1 (Ch 6, Force and Motion) 2 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 A toy box have a weight 180 N . The static friction coefficient between the box and floor is 0.42 . If the force F is applied at 42 o , what should be its magnitude to move the box? At which angle the force F required to move the box will be minimum? Given: Find: μ s = 0.42 F = ? = 42 o F min = ? mg = 180 N F s mg F , , , , , ,
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3 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 A 3.5 kg block is accelerated from rest by a compressed spring of spring constant 640 N/m . The block enters to the area with a coefficient of kinetic friction 0.25, and stops after moving 7.8 m with a friction. What are (a) the increase of thermal energy of block-floor system, (b) the maximum kinetic energy of the block, and (c) the original compression distance of the block? Given:
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