To calculate the effort force:
\[ EF = \frac{LF \times D1}{D2} \]
Where:
An effort force is defined as the force applied to a lever to produce a given lever force. The effort force is dependent on the distances between the fulcrum and the lever and effort force points.
Let's assume the following values:
Step 1: Multiply the lever force by the distance from the lever to the fulcrum:
\[ 100 \times 2 = 200 \]
Step 2: Divide by the distance from the fulcrum to the effort point:
\[ \frac{200}{0.5} = 400 \text{ N} \]