11 - 2nd Circular Law

11 - 2nd Circular Law - Static friction & Uniform...

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Static friction & Uniform circular motion Reading: 6.3-6.5 Chapter 6 HW: Problems 18 & 20 and static friction handout
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A) Push B) or pull?
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A) Push B) or pull?
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Static friction
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The ugly block It’s not moving! 2 N
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The ugly block T S,B = 2 N N T,B W E,B f T,B
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The ugly block N T,B T S,B = 2 N f T,B = 2 N W E,B
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The ugly block It’s still not moving! 4 N
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The ugly block N T,B T S,B = 4 N f T,B = 4 N W E,B
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The ugly block It’s still not moving! 16N
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The ugly block N T,B T S,B = 16 N f T,B = 16 N W E,B
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The ugly block It moves! 16.01N
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The ugly block N T,B T S,B = 16.01 N f T,B = ? W E,B
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It’s now a kinetic friction a N T,B T S,B = 16.01 N f T,B < 16 N f T,B = µ k N T,B W E,B
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Static friction • There is a maximum value of static friction that depends on surfaces and normal force. • The maximum force is given by f s = µ s N. • The static force “adjusts” to the demands. • We typically use Newton’s 2 nd Law to find the value of the static frictional force.
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Maximum static friction is greater than kinetic friction.
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11 - 2nd Circular Law - Static friction &amp; Uniform...

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