Compound Machines

 

After the simple machines were complete we were give the new task of combining the simple machines into one compound machine.  instead of trying for a mechanical advantage of 6 the goal was to obtain the largest mechanical advangtage possible.

We decided to use the pulley, the wheel and axil, and the lever. We were not allowed to use the incline plane. This was the opposite of when we were building the simple machines because we are not going for the AMA of 6. After many tries we were able to come up with a simple idea on how to get a high AMA. We were able to get an AMA of 39 witch mean we got a B+. I wasn’t too worried about the other groups because I really was only competing agents myself to get the best grade I could. But at the same time the way other groups combined their machines intimidated me to do better. Some of the other groups were recording massive amounts of mechanical advantages that completely surpassed our groups' final result.  We had a problem with finding the right place for the pulley to combine with the lever. We fixed this by combining them in different places and testing them to see which placement had the best AMA for is machine. Are methods were not the best but they worked out in the end. We could have spent more time on it rather than talking to other groups and getting distracted.

I learned that you can combine small machines to create one machine that could perform almost 50 times better than just one machine. It was very difficult to decide how we were going to place each machine and combined them for the best AMA. I was surprised to see how easy it was to move the hole machine to lift the wait. WE could take this project and combined it to are trebuchet to make it move quicker and have more accuracy.