Between the fulcrum and the line of action of the force. When force is forming an angle smaller than 90° with the
. When force is parallel to the dist
of action of force.

Independent variable is something that is changed in a experiment. 

The relationship of both of them

If you're looking for an even spread of clay, silt and sand, add a considerable amount of sand and some clay until the 3 even out". soil texture triangle. silty clay loam soil is approximately 20 percent or less sand, 25 to 40 percent clay, and 40 to 70 percent silt.