Answer: The force that supplies energy in a lever is known as the "input force" or "effort force." This is the force applied to one end of the lever to produce mechanical work or move an object. In a simple lever, the input force is used to overcome the resistance force, also known as the "load" or "output force," which is located at the other end of the lever. Levers are mechanical devices that can amplify or change the direction of the input force to perform various tasks.