Free Science Fair Projects
There are many free science fair projects available online or in science books. Fun science fair projects are no less valid than the kits you pay for. In fact, buying materials and using the instructions from free sources is just as valuable. It gives your children a real sense of experimentation. One of the best free science fair projects is the balloon rocket experiment. The balloon rocket teaches kids about pressure while allowing them to enjoy the process in a hands on environment. I recommend these fun science fair kits as a fast, simple way to get started on your science experiment. See examples of science fair projects below or check out our other pages: Make a Balloon Rocket
Category: Physics Ages: Elementary, Middle school To begin this experiment have your children set up a mini clothes line using the cotton thread. Before they tie the ends of the cotton thread to the clothes line anchors have them string the thread through a straw. Tie the cotton thread to its anchors and make sure the cotton thread is taut. Then, have the kids blow up a balloon and hold the end closed without tying it. Tape the straw horizontally to the top of the balloon. Once the balloon is securely attached to the straw tell them to let the balloon go. It will fly quickly from one end of the clothes line to the other. Then, explain to the children that the pressure differences in the balloon's air and the room air caused the balloon to move. The gas inside the balloon moves toward an area of lower pressure in an attempt to reach an equal state. Continue this experiment by having the children repeat the experiment to determine the balloons velocity. They will do this by measuring the distance the balloon travels and using the stop watch to record how long it takes to travel from one side of the clothes line to the other. They will divide the distance by the time to get the velocity. They can try this with different size balloons to see if there are variables.
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