The easiest mechanism to calculate mechanical advantage or drive ratio was the inclined plane because we did a lot of work with the levers.The hardest to calculate the mechanical advantage or drive ratio was the pulley system because before doing the math, we had to figure how much the weights weighed then we plugged them into the formula. The input force would be when we turned the belt and pulley system in the beginning. The output force would be when the car at the end hit all the bowling pins down except the 1. To make our compound machine more efficient, we could add rails so the cars wouldn’t get off track. Along with that we could have an actual track instead of it free rolling.