Comment by mtreis86
The top of fig 3 doesn't accurately represent a string pulled down in the middle. A string pulled down in the middle would have no curve to it in the legs unless some force is acting on it, it would look like a V.
The top of fig 3 doesn't accurately represent a string pulled down in the middle. A string pulled down in the middle would have no curve to it in the legs unless some force is acting on it, it would look like a V.
To me it seems like it's depicting a situation where the string hasn't been pulled fully, so some of its slack hasn't straightened out into the otherwise resulting triangle yet.