Effort force is defined as the force being used to get the work done.
Explanation: For example: you are dragging a block along a horizontal plane. A rope is attached to this block at an angle say 30 degrees to the block center line. Then the force used to get work done is equal to
pulling force x cos 30 is the effort force. It means that it is the horizontal component of the force that is acting along the rope as pull.