Yes. Get some help from a favorite science teacher. Have some interesting ideas to explore and start! Also you find information in the library or the internet about science fairs and ideas.
How the heart works.
Science fairs are very common in fifth grade. Some of the most common include a potato/copper battery, volcano, hydroponic experiments and a mouse-in-a-maze experiment.
There are many science ideas to be found online. Sites such as Science Buddies, Kidz World, Cool Science Projects, and even Brown University feature dozens of science fair ideas for multiple abilities and grade levels.
For a middle school aged child, you can find some excellent science fair solar system projects online. A great site to look for ideas is sciencebuddies.org. Look under the "Project Ideas" tab on that website.
There are many science projects one might do with a 9 volt battery. The official Energy Quest website has some great ideas that a science student may enjoy.
Good science fair projects could fall under a number of categories, including environmental science, astronomy, chemistry, and cooking/food science. For example, you could look at how light intensity from stars changes with distance.
Some ideas for a third grade science project are showing how aerobic and anaerobic decomposition occurs or if food items are fruits or vegetables. Other ideas are showing how a compass works or how to tell time using the sun.
Science projects for teens include: hometrainingtools.com/a/science-projects 101science.com/science_experiments.htm education.com/science-fair/physical-science/
Sciencebuddies.com has some interesting science fair ideas that are reasonably priced. You may also want to look at ehow.com.
Check out sciencebuddies.com they have some great projects!
There likely aren't any patterns for wood holders that you would be able to find in a retail store. I would suggest going to craft fairs and talking directly to people who make wood projects to get some ideas.