10_11_Potential_Energy

10_11_Potential_Energy - 10/11 Potential Energy Text:...

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Unformatted text preview: 10/11 Potential Energy Text: Chapter 6 Energy HW 10/11 Skidding Objects due Mon 10/15 Presentation Monday Presentation???? Exam II Thursday Oct. 18 5-7 PM Wit 116 Pat S. is in Union 201J 10-12 Wed and Fri (Drop-in tutoring at University Learning Center) Unsatisfactory reports due soon (by me) 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 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 = The ups = the downs or W = N Y + f f max W,B = s N W,B = s N X The lefts = the rights or N W,B = N X W = N Y + s N X But N Y = N X W = N X + s N X = N X (1 + s ) N X = (1 + s ) W = 15/1.5 = 10 N N H,B = 10 2 +10 2 = 14.1 N 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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This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Fall '08 term at North Dakota.

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10_11_Potential_Energy - 10/11 Potential Energy Text:...

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