10_17_Energy

# 10_17_Energy - 10/17 Spring Energy 0 0 0 0 Text Chapter 6...

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10/17 Spring Energy 0 Text: Chapter 6 Energy in Springs 0 Presentation 0 Exam II Thursday Oct. 18 5-7 PM Wit 116 0 Practice Exam II on web and Wit 213 also a practice problem 0 Suggested problems: 6-41, 42, 43

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Block up a ramp with friction: A block is held against a compressed spring then released. Find: The velocity at B The height at C The velocity at D Lost energy = -f R,B x = μ k N R,B x N R,B = W Y = 4 / 5 W E.B = 4 / 5 mg = 4N PE g,B = mgh B = 15J PE and h = 0 PE s,A - lost energy = KE B + PE g,B v B = 8.9m/s B A D C KE PE g PE s KE PE g PE s KE PE g PE s 0.5m 5.0m 3.0m 4.0m PE s,A = 1 / 2 k x 2 = 40J = 0.25(4)(5) = 5J 40 5 ? 15J ? KE B = 20J = 1 / 2 mv 2 m = 0.5kg k = 320N/m μ k = 0.25 g = 10N/kg W E,B Y N R,B W X f R,B KE PE g PE s
m = 0.5kg k = 320N/m μ k = 0.25 g = 10N/kg Block up a ramp with friction: A block is held against a compressed spring then released. Find: The velocity at B The height at C The velocity at D PE C = mgh C = 22.2J PE and h = 0 KE B + PE g,B = KE C + PE g,C v C = v X,B = 4 / 5 v B = 7.16m/s Energy conserved KE C = 1 / 2 mv 2 = 12.8J h C = 4.44m KE PE g PE s KE PE g PE s KE PE g PE s KE PE g PE s 0.5m 40J 20J 15J

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10_17_Energy - 10/17 Spring Energy 0 0 0 0 Text Chapter 6...

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