Simple machines in a roman ballista?

A Roman ballista is a type of ancient artillery that utilizes simple machines to launch projectiles. It primarily employs the principles of levers and torsion; the arms of the ballista act as levers, while the torsion mechanism, often made from twisted ropes or sinew, stores and releases energy to propel the missile. Additionally, the frame itself can be seen as a stable structure (a form of a lever) that supports the entire mechanism. These simple machines work together to achieve powerful and accurate long-range attacks.