When a trebuchet counterweight is hoisted by soldiers, what form of energy is transferred into the machine as work?

And trade experts recreate a medieval throwing machine called a trebuchet ... The potential energy from the raised counterweight is transformed into kinetic ... that was stored in the raised counterweight is transferred, in the form of kinetic energy, ... Design a working model of a trebuchet and demonstrate the power of a ... throwing machine called a trebuchet. To ... how well their designs will work ... Where does the potential energy in the lever arm come from? ... To put a trebuchet into its "cocked" position, a team of people use their energy to hoist ... was stored in the raised counterweight is transferred, in the form of kinetic energy, to the.