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10_10_Circular_Motion - 10/10 Vertical Circular Motion 0 0...

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10/10 Vertical Circular Motion 0 Text: Chapter 5 Circular Motion 0 HW 10/10 “Rotating Disk” due Fri 10/12 0 Lab Wrap-up 0 Presentation 0 Suggested Problems: Ch 5: 39, 41, 42 hint on 42, N drum,cloths = 0 for “losing contact.” 0 Exam II Thursday Oct. 18 5-7 PM Wit 116
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Your Lab W E,B T S,B y x T y T x M W E,m T S,M y x W E,M = T S,M = T S,B T x = F net = ma c = mv 2 /r L B After messy algebra: T 2 = Mg 4 π 2 Lm T 2 = L Mg 4 π 2 m Time (period) T 2 = g M 4 π 2 Lm 1 Slope
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The Hockey Shot A hockey puck is shot at the goal. The initial velocity of the skater (with stick) and the puck are both 10 m/s. The final velocity of the puck is 120m/s in the same direction as the initial velocity. Find the final velocity of the skater . 10m/s 10m/s Hockey rink N P,S N S,P What’s the plan? N P,S , 2nd Law, acceleration of skater, v, v f of the skater. t = 0.01s (estimate) a P = v/ t = 110/0.01 = 11,000m/s 2 N S,P = F net,P = m P a P = 0.5(11,000) = 5,500N= N P,S ! N P,S = F net,S = 5,500N = m S a S a S = 5,500/50 = 110m/s 2 v S = a S t = 110(0.01) = 1.1m/s v i,S v S v f,S = 10 - 1.1 = 8.9m/s m P = 0.5kg m S = 50kg
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