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September 17, 2014

September 17, 2014

Posted by **kim** on Monday, October 8, 2012 at 1:07pm.

also,

A mass m1 = 10kg resting on a rough horizontal table surface is connected by a massless cable over a frictionless wheel to a hanging mass m2= 5 kg,. What is the minimum co-efficent of static friction which will allow the masses to remain at rest?

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**Elena**, Monday, October 8, 2012 at 3:11pm1.

h=at²/2

a=2h/t²= 2•1/1.2²=1.4 m/s²

m2•a =m2•g –T = > T = m2•g-m2•a.

m1•a=T-F(fr) = T-μ•N= T-μ•m1•g = m2•g-m2•a- μ•m1•g.

μ=[m2•g – a(m1+m2)]/m1•g = [5•9.8 – 1.4•15]/10•9.8 = 0.27.

2.

0 = m2•g –T

0=T-F1(fr) = T- μ(s) •m1•g

m2•g = μ(s) •m1•g,

μ(s) = m2/m1=5/10 = 0.5

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