# Homework Help: Difficult Free Body Diagrams

1. Sep 14, 2009

### megr_ftw

1. The problem statement, all variables and given/known data
Here is pictures of some of the mechanisms I draw the free body diagrams for

2. Relevant equations
$$E$$F= 0
$$E$$M= 0

3. The attempt at a solution
I am not sure how to even begin on the first problem other than drawing the force from the hand of 400 N.

2. Sep 14, 2009

### nvn

Hi, megr_ftw. Read your text book, and study the example problems, and this will show you how to get started. You must show your work; and then someone might check your math.

3. Sep 14, 2009

### megr_ftw

my book isn't very good with example such as the ones above. I just need help getting started, im not asking anyone to solve all 3 of them, just some advice.

4. Sep 14, 2009

### nvn

Hint: Draw member ABC. Then draw reaction forces acting on member ABC in the x and y directions at the supports (points A and B).

5. Sep 14, 2009

### megr_ftw

draw nothing for C or D?

6. Sep 14, 2009

### nvn

Draw nothing for D. Draw the 400 N force at C.