# Two blocks and a pulley, friction

## Homework Statement

Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on the horizontal surface is 6.0 kg. Find the acceleration of the mass.

T=mBg-mBa

## The Attempt at a Solution

I've basically done this problem without factoring friction, and this my problem, I don't know how to factor friction.

a = (mBg)/(mA + mB) is what I used.

Thanks!!

Hootenanny
Staff Emeritus
Gold Member

## Homework Statement

Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on the horizontal surface is 6.0 kg. Find the acceleration of the mass.

T=mBg-mBa

## The Attempt at a Solution

I've basically done this problem without factoring friction, and this my problem, I don't know how to factor friction.

a = (mBg)/(mA + mB) is what I used.

Thanks!!
Welcome to Physics Forums,

You should look again at the tension in the string, is that the only condition that the tension needs to satisfy? What about the other block?