 213
 2
1. Homework Statement
In order to lift the 30 kg mass, a Force F is applied to the massless meter stick shown below. How much weight must the fulcrum bear if the mass is to be lifted?
2. Homework Equations
R/E = l/L
3. The Attempt at a Solution
So I began with the formula above and this is my set up:
300/F = 0.25/0.75. I got 900 N for F. However, the problem asks about the fulcrum. Logically I would add the 900 N with the 300 N of the resistance force by the mass, I get 1200 N. Since the answer is 400 N, it appears that I have to divide the Force lever arm distance to determine the force on the fulcrum? I think this is the right reasoning here but would appreciate any insight in to this problem.
In order to lift the 30 kg mass, a Force F is applied to the massless meter stick shown below. How much weight must the fulcrum bear if the mass is to be lifted?
2. Homework Equations
R/E = l/L
3. The Attempt at a Solution
So I began with the formula above and this is my set up:
300/F = 0.25/0.75. I got 900 N for F. However, the problem asks about the fulcrum. Logically I would add the 900 N with the 300 N of the resistance force by the mass, I get 1200 N. Since the answer is 400 N, it appears that I have to divide the Force lever arm distance to determine the force on the fulcrum? I think this is the right reasoning here but would appreciate any insight in to this problem.
Attachments

17 KB Views: 234