My Innovation Day project is based on the Grade 4 science unit of Pulleys. We have learnt about fixed and moveable pulleys. I used a fixed pulley system for my project because it was on a sick so it was not a movable pulley.
For my hypothesis, I said: “I think it might work because of the total of four pulleys. Three big ones and one small one. The big pulleys connect to each other. They do that because when the stick gets pulled, it pulls the pulleys that pull the road up. The small pulley connects the stick to the big pulleys.”
This is a video for how to make a simple drawbridge: https://www.youtube.com/watch?v=Ah-l88JAAaE&t=172s&ab_channel=OliverThiel
Here are my results:
My conclusion is: My hypothesis was incorrect because I realised that the only way to connect the pulleys to the structure was to either hot glue it to one of the sides or to tape it. They both would have made it unable to spin/move/turn.