Make a stack of 5 or 6 pennies. Use another penny to try to knock the bottom penny out, while keeping the rest of the stack in tact.
Go a step farther and make your stack of pennies on a piece of paper. Trace a circle around the pennies. Now, try to keep the stack of pennies in the circle after you knock the bottome one out.
My son and I recently found your blog. These are great experiments and projects! I couldn't find your e-mail address so I'm posting a comment here to let you know that we did a post mentioning you. We use our blog in the old fashioned way as a personal "web log" just to keep track of things that we enjoy and want to refer back to. (I write a sentence for other parents at the top of each link but the blog is primarily for my kids to use.) The images are visual reminders to help them find what they are looking for. In your case, we used the "science matters" image. So, if there's another image that you prefer we use on our post, feel free to let me know which one and I'll change the image on the post. http://inspirestudy.blogspot.com/
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