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10_01_Energy_Intro

# 10_01_Energy_Intro - 10/1 Energy Intro 0 Text Chapter 6...

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10/1 Energy Intro 0 Text: Chapter 6 Energy, Read 4.9 for Wednesday (friction) 0 Exam I…Average = 73%!!!!! Nice Job! 0 First presentation on today 0 HW 10/1 “2nd Law in 2-D” due Thursday 10/4 0 Lab: “Atwood’s Machine” (Energy) 0 “Peer Guides” in “Physics Guidance Center”

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Atwood’s Machine m 1 m 2 Find the acceleration of the masses Let g = 10 N/kg m 1 = 4kg, m 2 = 3kg m 1 m 2 a = a = F net = F net = W E,1 W E,2 T S,1 T S,2 = = 40N = 30N Apply 2nd Law W 1 -T S = m 1 a T S - W 2 = m 2 a W 1 - W 2 = (m 1 + m 2 )a a = W 1 - W 2 m 1 + m 2 a = 10 / 7 = 1.4m/s 2
Energy Introduction (Lab) The equation I never let you use: v i 2 + 2a x = v f 2 Multiply by the mass of the object, m: mv i 2 + 2ma x = mv f 2 Divide by 2: 1 / 2 mv i 2 + ma x = 1 / 2 mv f 2 Note that ma = F net :(2nd Law) 1 2 i 2 1 2 f 2

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Energy Introduction (Lab) Find the final velocity of a falling object two ways: 2nd Law Energy 2.8m v 0 = 2m/s v f = ? Let’s see…
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10_01_Energy_Intro - 10/1 Energy Intro 0 Text Chapter 6...

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