- #1

Strawer

- 10

- 0

## Homework Statement

Two blocks with equal masses m1=m2=5kg are connected via a pulley, as shown. Take [itex]\mu[/itex] = 0.25. Find the acceleration given that a) m1 is moving down, b)m1 is moving up. If m2=6 kg for what values of m1 will the pair move att constant speed?

## Homework Equations

F=ma, f=[itex]\mu[/itex]N

## The Attempt at a Solution

I've managed to solve a) and c) but not b).

I don't understand how m1 can be moving up, since m1=m2 and the force m2 affects m1 with is sin(37)*m2g < m1g.

If m1 is moving up doesn't that mean that it will not affect the other mass? I mean shouldn't the tension on m2 be zero? If so then we have [itex]\Sigma[/itex]F=5*9.8*sin(37)-0.25*9.8*cos(37)*5=19.7

Which gives a=19.7/5=3.94 m/s^2 However it should be 2.94 m/s^2 according to the answer sheet.