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# pp10 - PHYSICS A World View Tuesday 15 February READ Ch...

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PHYSICS: A World View Tuesday, 15 February READ Ch 5 (pp 77-86); PS 5: 1-4 PRAC Ch 4: Q 1, 7, 11, 13; E 3 HW #10 Ch 4: Q 4, 8, 10; E 4 Th 17 Feb

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Exam #1 needs to be postponed until Tuesday, February 22 nd .
New homework policy: Late homework will be accepted until  3:00 pm, twice. I will drop your lowest four homework  scores. No homework will be accepted after 3:00  pm the day it was due for any reason.

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the force of the cord on your ankles is ___ the force of your ankles on the cord. 1 2 3 33% 33% 33% 1. less than 2. equal to 3. greater than 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
the force of the cord on your ankles is ___ your weight. 1 2 3 33% 33% 33% 1. less than 2. equal to 3. greater than 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

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Coefficient of kinetic friction: symbol  μ k represents the “roughness” of the  surfaces must be measured or tabulated for any  pair of surfaces just a number
The Ugly Block 2 N

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The Ugly Block T S,B = 2 N N T,B W E,B f T,B
The Ugly Block T S,B = 2 N N T,B W E,B f T,B = 2 N

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The Ugly Block 4 N
The Ugly Block T S,B = 4 N N T,B W E,B f T,B = 4 N

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The Ugly Block 16N
The Ugly Block T S,B = 16 N N T,B W E,B f T,B = 16

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The Ugly Block 16.01N
The Ugly Block T S,B = 16.01 N N T,B W E,B f T,B = ?

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It’s now a kinetic friction T S,B = 16.01 N N T,B W E,B f T,B < 16 N a
Maximum static friction is greater than kinetic friction. Static Friction f s = 0 f s = μ s N Can be anywhere in this range. Kinetic Friction f k = μ k N ALWAYS this value

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Static friction There is a maximum value of static friction  that depends on surfaces and normal  force.
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pp10 - PHYSICS A World View Tuesday 15 February READ Ch...

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