Posted by **ally** on Tuesday, May 8, 2012 at 1:43am.

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 please help ! -
**Elena**, Tuesday, May 8, 2012 at 1:29pm
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.

## Answer this Question

## Related Questions

- @ elena - In the figure the coefficient of static friction between mass (MA) ...
- physics please help ! - In the figure the coefficient of static friction between...
- physics - In the figure the coefficient of static friction between mass (MA) ...
- physics - In the figure the coefficient of static friction between mass (MA) and...
- Physics - Suppose a hanging 1.0 kg lab mass is attached to a 4.0 kg block on the...
- Physics - Consider the figure below. (Let w1 = 150 N and w2 = 38.0 N.) (a) What ...
- Physics - A trash can with a mass of 5 kg has a coefficient of static friction ...
- physics - The coefficient of static friction between a block and a horizontal ...
- physics - In the figure below, m1 = 10.0 kg and m2 = 4.5 kg. The coefficient of ...
- physics - The coefficient of kinetic friction between a refrigerator (mass 93 kg...

More Related Questions