Levers consist of three parts or actions working together. On the basis of the locations of fulcrum load and effort the lever is divided into three types. Parts Of A Simple Machine Flex Resource Simple Machines Force And Motion What Is Cultural Appropriation Parts of a LeverS. . The point at which a lever pivots or. Rees has been building harps since 1972. Load forces are often the weights of the body parts that are moved or forces needed to. A rigid structure bone. The liver is a triangular bilobed structure consisting of a larger right lobe and a smaller left lobe. Bones act as lever arms. The effort input force and load output force are applied to either end of the beam. To understand why some synovial joints have more efficient lever systems we must first understand the relationships between the three lever parts. The physical lever itself made of materials such as wood metal or plastic bone in humans