VanCleave's Science Fun

Your Guide to Science Projects, Fun Experiments, and Science Research

ABOUT THE SOUND PICTURE

With mouth wide open, vibrating air coming up the throat from the vocal chords leaving the open mouth and spreading in all directions. Hi, I am Janice VanCleave, author of 50+ best-selling science experiment books for children ages 4 through high school. I taught science for 27 years and now am creating this science website.   My scream was not staged. The picture was to be of two adult cats, which I was holding. A microsecond before the camera snapped, the two cats dug their claws into my skin as they prepared to leap out of my arms. A picture like this is great for making inferences. Kids could make "guesses" as to why I am screaming. They would be drawing on facts from the photo, such as I look like I am in pain or maybe I am just pretending.

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Home » Testing The Strength of Egg Shells

Testing The Strength of Egg Shells

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Spring and eggs just seem to go together. This is because eggs are a symbol of fertility, thus the perfect symbol for spring, which is a time of birth and growth. One of the many egg experiments that amazes kids of all ages is testing the strength of eggshells.

egg-dawn

Eggs are easily cracked if hit on the side, but the dome-shaped ends will support a great deal of weight. This is because weight pushing down on top of the domed-shaped egg doesn’t push straight down, instead the weight spreads outward along the curve of the egg.

The photo is of Dawn Shock, a fun lady who presents science programs for kids and educators. You can find out about Dawn’s “Grandma’s Science ” programs at : www.grandmascience.com

Dawn has a stack of books resting on 4 empty eggshells. Following are instructions for preparing the eggshells:
1. Use the edge of a spoon to carefully break off the small end of each eggshell. If any cracks form up the side of a shell, discard it and use another egg.

2. Shake out the contents of each egg into a bowl, then rinse the inside of the eggshells with water. Carefully dry the outside of the shells with a paper towel.

3.  In order to have the eggs the same height and even on the bottom edges,  wrap a piece of masking tape around each egg. The position of the tape should be the same on each shell.

4. Use scissors (fingernail scissors work best) to cut away the broken ends of the shell from around the bottom of the tape on each shell.forces-eggs

5. Place a book on top of the shells, and position the shells so that one is under each corner of the book.

6. Carefully add books, one at a time to the book on top of the eggshells, waiting a few seconds before adding the next book.

7. Stop adding books when you hear a cracking sound. You can use a bathroom scale to determine the weight of the books supported by the egg shells.

More EGG-Speriments

Ostrich Eggs are strong and great for observing the
physical properties of matter. Source for Ostrich Eggs

Ostrich Eggs from Education Innovations. Great for Physical Properties Investigations.

WWW.Teachersource.com

 

Exciting Engineering Ideas, projects, and activities for schools, science fairs, and just plain fun!

Note: The texture on the Ostrich Eggs is natural.

Structural Engineers design and build many different things, such as egg cartons.But a person doesn’t have to have a degree in engineering to invent something. This is true for the person who invented the egg carton. History Of Egg Cartons.