1. The problem statement, all variables and given/known data Okay, so I am doing a physics investigation and I am supposed to have a theory I can test. I have a catapult I made myself, and I change the force exerted on the rod of the catapult by changing the mass that hangs by a string. It is a seesaw with a hinged mass on one end. I am trying to find out how the mass affects the time of launch. How can I know what correlation they have? 2. Relevant equations How do I create a theory about the correlation between the hinged mass and the time the rod takes to launch? 3. The attempt at a solution I have tested it using different masses and my results showed that the larger the mass hanging by the string, the shorter the time of launch is. I believe this is because the tension of the string gets larger and thus the force that causes the catapults rod to rotate is. larger. I've tried to create some kind of equation that shows the relationship, but too many properties change in the catapult. If I increase the mass, I believe the acceleration increases, thus the speed. So how do I show a theoretical relationship between the mass and the time of launch?