- #1

jwxie

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- 0

## Homework Statement

Masses m1 = 4.0kg and m2 = 9.0kg are connected by a light string that passes over a frictionless pulley. As shown in Figure, m1 is held at rest on the floor and m2 rests on a fixed incline of 40 degree. The masses are released from rest, and m2 slides 1.00m down the incline in 4.00s.

Determine

**a) the acceleration of each mass**

**b) the tension in the string**

**and c) the coefficient of kinetic friction between m2 and the incline.**

## Homework Equations

Fnet = ma

distance formula

d = 1/2at^2 when vi = 0

## The Attempt at a Solution

Well, I know the acceleration for m2 is 0.125m/s^2 using the distance formula when vi=0.

but then i got stuck at the rest, i tried to find acceleration of m1 but didn't work out at all.

well if i tried

m2gcos - m1g = m2a1+m1a2

(since incline plane i can find fg by m2gCos)

but the problem is, i totally ignore the friction Ff i think...

this is why i come up with answer like 6.8m/s^2 for mass1.

the rest will be wrong if i can't set up a system of equation for #1

i tried, like

m2gCos + Ft = m2a

m1g + (-Ft) = m1a

Ft means force of tension