# Homework Help: Help, this is a pulley question

1. Nov 11, 2009

### ashvinthecha

1. The problem statement, all variables and given/known data
In an Atwood's Machine, the larger mass is 1.8kg and the smaller mass is 1.2.
(A)Ignoring friction what is the acceleration of the masses?
(B)What is the tension of the string.

- I know you have to find the acceleration to get the tension but i dont know how to find the acceleration.
I think you replace net force with T-(the mass) ut i am also unsure of why you do that.

2. Nov 11, 2009

### ashvinthecha

Pulley question -test tomorrow!!!!!!

1. The problem statement, all variables and given/known data

In an Atwood's Machine, the larger mass is 1.8kg and the smaller mass is 1.2.
(A)Ignoring friction what is the acceleration of the masses?
(B)What is the tension of the string.

2. Relevant equations

Fnet=ma

3. The attempt at a solution

T-1.2g = 1.2a
T = 1.2g + 1.2a

3. Nov 11, 2009

### 1irishman

Re: Pulley question -test tomorrow!!!!!!

which mass is the hanging mass?

4. Nov 11, 2009

### 1irishman

Re: Pulley question -test tomorrow!!!!!!

5. Nov 11, 2009

### 1irishman

sorry...wrong question

6. Nov 11, 2009

### 1irishman

1.96 m/s^2 is a i think.

7. Nov 11, 2009

### 1irishman

don't forget to include the 1.8kg mass to get the acceleration