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April 16, 2014

Homework Help: @ elena

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

In the figure the coefficient of static friction between mass (MA) and the table is 0.40, whereas the coefficient of kinetic friction is 0.28 ?

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 = m2g.
k1 m1 g= m2g,
m1 = m2/k(s) = m2/0.4.

(b)
Block A:
T = F(fr) = k2 N = k2 m1 g,
Block B:
T = m2g.
k2 m1 g= m2g,
m1 = m2/k2 = m2/0.28.

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

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