I made a catapult in technology. It was really fun, and did not take long. We had to make a Flipgrid of us testing out our catapult, mine worked really well. I put a dice inside of it, and it shot it out across the room. Then, we measured and got the mechanical advantage. My effort arm is 63.5 mm. My load arm is also 63.5 mm. We had to divide those together to get the mechanical advantage, which was one.