Two blocks and two pulleys pulley system

[disruptors]

Hey ppl, sorry I was just wondering if anyone knew how to do the question i posted earlier(TWO BLOCKS AND TWO PULLEYS), as I have to submit it and cannot figure it out still!?

Thanks...

 

[tiger_striped_cat]

can you post a picture of it. I'm having trouble picturing this system.

 

[disruptors]

here's the pic, thanks

 

[tiger_striped_cat]

where? I don't see it as part of your post

 

[disruptors]

oh sorry tiger, its okay i had to submit it, thanks for your time...i can't get the pic up for some reason..

 

[disruptors]

never mind must have been my browser

 

[tiger_striped_cat]

well how did you do the first part? it looks right to me. you did:

$$\sum{F} = ma$$

always always ALWAYS start with this over and over again (or at least try to strat with this). The right hand side will have only ma or 0 that's all it will ever have ( and zero is a particular case of ma--when it is not accelarating, that is, not moving, or constant velocity) The left hand side just sums your forces. So after picking your postitive and negnative on your x and y-axis (always do this too) and drew your free body diagram (I hop you did this) you must of did:

$$T + T = m_2a_2$$

And then you solved for T

Now for the next part do the same thing

1) Draw FBD
2) $$\sum{F} = ma$$
3) $$T - m_1g = m_1a_1$$

And then solve for $$a_1$$ in terms of everything else they gave you