# Torque/Lever HELP!

1. Oct 27, 2008

### jammhawk

1. The problem statement, all variables and given/known data
What is the mass of the meter stick, which is shown in the sketch below while it is balanced?

a 160 grams b 120 grams c 80 grams d 200 grams e none of the above
2. Relevant equations

3. The attempt at a solution

I am completely CONFUSED! Our professor never discussed finding the mass of the lever.

2. Oct 27, 2008

### thepanda

The meter, you can think of like a mass that adds torque to the system. Consider the each side of the meterstick as a mass concentrated at that center of gravity for the side. Then you can solve for the sum of the torques = 0.

3. Oct 27, 2008

### christensen

To reiterate what thepanda said, think of the leaver as mass less, and simply assume there is a mass of "x" weight hanging from the 50cm mark of the meter stick (20cm to the right of the fulcrum). Simply solve for "x".

*It is placed here because it is the object's center of mass

4. Oct 27, 2008

### jammhawk

Okay I know I am going to sound completely stupid, but I am still getting really confused. I have a political science degree and working on a history degree. I am in the lowest level physics and I am still getting really confused.

Sorry.

5. Oct 27, 2008

### jammhawk

so does X = 120 grams?

6. Oct 27, 2008

### christensen

that is the correct answer.