Balloon Rockets: What you need: Piece of yarn (or string) – cut to about 6 feet, thread on a straw and tie string to two chairs. Put tape on straw to attach a Balloon that has been blown up but has not been tied. Pull attached balloon to one side and let go! Experiment shows action and reaction. Kids will want to do over and over so be prepared to blow up a few balloons and have extra tape on hand. Link leads to step by step instructions with a photo tutorial.
How to make a Simple Paper Rocket Launcher (Watch Video) This is a very simple design that will shoot a paper rocket over 50 feet. It has plenty of power. This project would make a get office toy. All you need is a 2ltr bottle, a 12 inch section of 1/2 inch PVC, and a paper rocket. The paper rockets are very easy to make. To make one, you will need a couple sheets of paper, tape, and scissors. This is a great toys for kids. www.specificlove.com