- #1

- 8

- 0

## Homework Statement

## Homework Equations

## The Attempt at a Solution

Please teach me how to solve this

thanks!

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter drastice
- Start date

- #1

- 8

- 0

Please teach me how to solve this

thanks!

- #2

Doc Al

Mentor

- 45,075

- 1,382

Show your work and you'll get plenty of help.

You might want to read this: http://hyperphysics.phy-astr.gsu.edu/hbase/N2st.html#c1"

You might want to read this: http://hyperphysics.phy-astr.gsu.edu/hbase/N2st.html#c1"

Last edited by a moderator:

- #3

- 8

- 0

Show your work and you'll get plenty of help.

You might want to read this: http://hyperphysics.phy-astr.gsu.edu/hbase/N2st.html#c1"

Well i don't have a lot of work to show.. I know

F=ma

The bottom one i believe would be *gravity (9.*8)

i'm just really lost on what equation i need to be using to get the tension in this setup

Last edited by a moderator:

- #4

Doc Al

Mentor

- 45,075

- 1,382

You'll need to draw free body diagrams for each mass, then apply Newton's 2nd law to each.

- #5

- 8

- 0

t=m1a

??

but i am missing acceleration and tension so how do i solve when i have 2 unknowns?

- #6

- 1,137

- 0

and use the hint of question to find the acceleration of the blocks

- #7

Doc Al

Mentor

- 45,075

- 1,382

Almost. Fix your first equation using cupid.callin's hint.m2g-t=m2a

t=m1a

Luckily you have two equations.but i am missing acceleration and tension so how do i solve when i have 2 unknowns?

- #8

- 8

- 0

and use the hint of question to find the acceleration of the blocks

i'm not sure what you mean by that.. I'm looking at the link he gave me using the horrizontal pulley... Is this not the right equation? i don't see why you guys can't help me with the right equation

and for acceleration m2*gravity/m1+m2 = acceleration right??

- #9

Doc Al

Mentor

- 45,075

- 1,382

That's a different problem. In your problem there's a pulley attached to the falling mass. Get the idea, don't just copy the equation.i'm not sure what you mean by that.. I'm looking at the link he gave me using the horrizontal pulley... Is this not the right equation?

We are helping. (But we're not going to do it for you.)i don't see why you guys can't help me with the right equation

No.and for acceleration m2*gravity/m1+m2 = acceleration right??

Don't skip steps. Fix your equation for the falling mass. Then you can solve for the acceleration and tension.

- #10

- 8

- 0

That's a different problem. In your problem there's a pulley attached to the falling mass. Get the idea, don't just copy the equation.

We are helping. (But we're not going to do it for you.)

No.

Don't skip steps. Fix your equation for the falling mass. Then you can solve for the acceleration and tension.

I don't expect you to do it for me... All i am asking is for the right equation.. I understand how to get acceleration i'm having trouble with the Tension..

i don't understand when he says "you sure tension on m2 till be just T ?"

- #11

Doc Al

Mentor

- 45,075

- 1,382

How many rope segments pull on mass 2?

- #12

- 8

- 0

How do i add this to the equation?

- #13

Doc Al

Mentor

- 45,075

- 1,382

What are all the forces acting on m2? Each rope segment applies its own tension.

- #14

- 8

- 0

What are all the forces acting on m2? Each rope segment applies its own tension.

it has gravity and tension from both ropes..

I have no idea how to add this to the equation though.

- #15

- 8

- 0

i just don't understand that equation.. You're not doing the problem for me be helping me with an equation... ;[

- #16

Doc Al

Mentor

- 45,075

- 1,382

You don't 'add it' to the equation, you use it to come up with a correct equation. The approach is always the same: ΣF = ma.it has gravity and tension from both ropes..

I have no idea how to add this to the equation though.

We've been focusing on the forces on m2 (the ΣF part of the equation), but you are making a second error. You have called the acceleration of each mass 'a', but their accelerations are not the same. (See the hint given in your diagram.)

- #17

verty

Homework Helper

- 2,164

- 198

i just don't understand that equation.. You're not doing the problem for me be helping me with an equation... ;[

Doing the problem for you would be against the rules. If you don't understand the help that is given to you, then you must learn more so you can understand it.

Share: