Moments - Balancing a weighted meter stick

[alexmahone]

Moments -- Balancing a weighted meter stick

A meter stick is found to balance at the 49.2cm mark when placed on a fulcrum. When a 46.0g mass is attached at the 14.7cm mark, the fulcrum must be moved to the 38.7cm mark for balance. What is the mass of the meter stick?

I know I have to use moments but I don't know where to start. Any help would be appreciated.

 

[berkeman]

A meter stick is found to balance at the 49.2cm mark when placed on a fulcrum. When a 46.0g mass is attached at the 14.7cm mark, the fulcrum must be moved to the 38.7cm mark for balance. What is the mass of the meter stick?

I know I have to use moments but I don't know where to start. Any help would be appreciated.

Draw FBDs for the two situations, and show the torques about the fulcrum. When the stick is balanced, what must the sum of the torques be?

(BTW, I will add some more descriptive words to your thread title -- 1-word titles are not generally allowed in the technical PF forums.)

 

[alexmahone]

Draw FBDs for the two situations, and show the torques about the fulcrum. When the stick is balanced, what must the sum of the torques be?

(BTW, I will add some more descriptive words to your thread title -- 1-word titles are not generally allowed in the technical PF forums.)

Thanks. Once I drew the FBDs, I got the answer. :D

 

[berkeman]

Sweet!