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April 23, 2014

April 23, 2014

Posted by **ally** on Tuesday, May 8, 2012 at 9:30pm.

part a) What minimum value of (MA) will keep the system from starting to move?

part b) What value of(MA) will keep the system moving at constant speed?

physics - Elena, Tuesday, May 8, 2012 at 1:35pm

Block on the table m(A) = m1,

block on the cord m2,

the coefficient of static friction is k1=0.4,

the coefficient of kinetic friction is k2 =0.28

(a)

Block A:

T = F(fr) = k1 •N = k(s) • m1 •g,

Block B: T = m2•g.

k1 • m1 •g= m2•g,

m1 = m2/k(s) = m2/0.4.

(b)

Block A:

T = F(fr) = k2 •N = k2 • m1 •g,

Block B:

T = m2•g.

k2• m1 •g= m2•g,

m1 = m2/k2 = m2/0.28.

- thanks for the help, i am having a lot of trouble with this problem, what is m2 ?

- @ elena -
**kle**, Tuesday, May 8, 2012 at 10:29pmnvm i got the answer, i was just cofused on how you explain it. Thank you . I got 5 for part a and for part b got 7.14. thank you

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