# Direction of concurrent forces

1. Oct 19, 2015

### werson tan

1. The problem statement, all variables and given/known data
Which is the correct diagram for concurrent forces? The left or the right one ?

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### 33.png
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2. Oct 19, 2015

### BvU

Both diagrams are identical.

3. Oct 19, 2015

### werson tan

no , one is all the forces acted towards the circle , the another one is forces away from the circle..Which is the correct diagram for concurrent forces?

4. Oct 19, 2015

### BvU

Ah, so there is a context.
My answer was based on the idea that a force can be moved along its line of action.
Apparently the circle represents something that can be deformed so that the above rule doesn't apply any more ?

5. Oct 19, 2015

### werson tan

assuming they are the similar circle , no deformation occur (rigid body)Which is the correct diagram for concurrent forces?

6. Oct 19, 2015

### BvU

Sorry, I still don't get what this is about. What are concurrent forces ? And what would those forces be if they were not concurrent ? Countercurrent ? Cooperative ?

7. Oct 19, 2015

### BvU

Ah ! Google to the rescue. Concurrent means the lines of actions are going through one single point

8. Oct 19, 2015

### BvU

Really a good source, this google search: both pictures are concurrent forces. One is compressive.

9. Oct 19, 2015

### BvU

And now that we know what we are looking for: the inwards or outwards isn't the deciding factor. Protract the force lines and see if they go through one single point.

For experts only: the problem statement is incomplete if it doesn't state that the forces shown are coplanar !

10. Oct 19, 2015

### BvU

I like to be liked, but I like it even better when a student understands. Was this a homework exercise where you reconstructed the original picture and you now know which feature is the one that requires the most attention ?

And now that I know you can post a drawing -- how are we doing with the torque equilibrium exercise ?

11. Oct 19, 2015

### werson tan

no, this is not an exercise . I just dont understand the notes given by my lecturer , and i ask here

12. Oct 19, 2015

### BvU

I see. All clear now, I hope.