What are some ways to use elastic force to move a cart? Well, I came up with a smarticle idea. ( ok. So mr. G gave me the idea! So what. Don't you give me that look!) so my smarticle idea is that I will take the rubber band and break it so that it is one long strechy string and I will tape it to two nice solid objects. Then I will place the cart in front of it and then I will pull the cart back and let it go. I have made my very own smarticle slingshot=http://!