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10_11_Potential_Energy - 10/11 Potential Energy 0 0 0 0 0 0...

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10/11 Potential Energy 0 Text: Chapter 6 Energy 0 HW 10/11 “Skidding Objects” due Mon 10/15 0 Presentation 0 Monday Presentation???? 0 Exam II Thursday Oct. 18 5-7 PM Wit 116 0 Pat S. is in Union 201J 10-12 Wed and Fri (Drop-in tutoring at University Learning Center) 0 Unsatisfactory reports due soon (by me)
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The Book on the Wall A block is held at rest by a hand as shown. The force the hand applies to the block is at 45° with respect to the wall. The mass of the block is 1.5kg. Let g = 10N/kg and μ s = 0.5. There are two cases, one where the block is about ready to slip up and one where the block is about ready to slip down. 45 ° What is the minimum force that the hand puts on the block to prevent it from sliding down? B W E,B N H,B f W.B N W,B a = F net = 0 0 “The ups = the downs” or W = N Y + f f max W,B = μ s N W,B = μ s N X “The lefts = the rights” or N W,B = N X W = N Y + μ s N X But N Y = N X W = N X + μ s N X = N X (1 + μ s ) N X = (1 + μ s ) W = 15/1.5 = 10 N N H,B = 10 2 +10 2 = 14.1 N
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The Book on the Wall A block is held at rest by a hand as shown. The force the hand applies to the block is at 45° with respect to the wall. The mass of the block is 1.5kg.
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