In this challenge we have to make a pulley. It has to be able to lift 3 blocks and it has to be able to stay at the top. It also has to have a platform.
We have made the design that was in the book. The string is not long enough so it will not go up 3 inches. And we have to add a platform to hold the blocks.
We were successful on the first try. After we added weight to the bottom. And made the string longer.