(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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.

Determinea) the acceleration of each massb) the tension in the stringand c) the coefficient of kinetic friction between m2 and the incline.

2. Relevant equations

Fnet = ma

distance formula

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

3. 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

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# Homework Help: Motion with incline

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