Seventh Grade Science Experiments (Page 92)

Do-Re-Mi with Straws

Science Fair Project Idea

Scientific Method

Do you love to make music, but do not have access to all the instruments you would love to play? Check out this fun science fair project about the physics of musical sound production. You will make musical instruments with drinking straws, one for each note on a one-octave major scale. Can you figure out the right lengths for a series of straw "oboes" in order to play a musical scale? Read more

Drawing Circles Around Ants

Science Fair Project Idea

Scientific Method

Do ants sometimes ruin your picnic? There are some chemical ant repellents you can spray to keep them away, but who wants to spray poison all over their food? In this science project you can investigate some less toxic solutions that may be around your home so that your next picnic will not become an ant buffet! Read more

Drive a Race Car with Machine Learning

Science Fair Project Idea

Engineering Design Process

How do you design a program that can pilot a self-driving race car? By using machine learning. In this project, you will train your own machine learning model for an autonomous vehicle, the AWS (Amazon Web Services) DeepRacer. You can run your car's machine learning model on a simulated racetrack (Figure 1), or you can purchase a 1/18 scale model vehicle that can race on a physical track (Figure 2 - note: new cars are no longer for sale, but you may be able to purchase a used one on a site like… Read more

Duplicate Your Drawings with a Machine

STEM Activity

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Have you ever wished you could copy a drawing but make it larger or smaller? If you've tried to create a larger or smaller copy of your work, you've probably realized that it is very hard to get the details right. A machine called a pantograph, however, could help. It makes copies that can be scaled up or down or made the same size. In this activity you will make your own pantograph and then duplicate your drawings. Can you figure out how it enlarges, shrinks or turns drawings upside down? Read more

Engineer a Cell Phone Stand

Science Fair Project Idea

Engineering Design Process

Look around you. What types of objects do you see in the room? Furniture, lights, a computer, a fan, pencils, books, etc.? Where did they come from? Odds are you did not build them yourself. You or your parents probably bought them at a store. Before that, they were built in a factory somewhere. And even before that, they were probably designed by engineers. You might think of engineers when you think of complex machines like rockets or huge structures like bridges, but engineers also design… Read more

Explore Matchstick Rockets

STEM Activity

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If you have wondered how rockets are propelled forward or if you enjoy the excitement of launching a rocket, this is an activity for you! You will learn how to make tiny rockets from aluminum foil and matchsticks, and how to ignite them safely. Soon, you will be launching one rocket after the other! Your challenge will be to find the most reliable launching mechanism. Read more

Explore the “POP” in popcorn

STEM Activity

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Do you like popcorn? It’s not only a tasty snack but also fascinating to watch when it pops in the pot. But why does it do that? What makes the small popcorn kernel jump into the air and change its appearance? Where does the characteristic popping sound come from and does every corn pop? There are many good questions about such a simple snack. Are you curious to find out some answers? In this activity you will do some popcorn science and even get to snack on your experiment. Read more

Exploring Fractals

Science Fair Project Idea

Scientific Method

Although fractal images can be intriguingly complex, fractals are more than just pretty pictures. In this project, you'll explore the mathematical properties of the famous Mandelbrot (illustration on the Background tab) and Julia sets. You'll learn about how these images are generated, and about the relationship between the Mandelbrot set and the Julia sets. Read more

Exploring Mummification with Hot Dogs

STEM Activity

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Have you ever seen or heard of the movies "The Mummy" or "The Mummy Returns"? Mummies have often played a part in nightmares for Western cultures, but in ancient Egypt, mummification was a serious religious ritual thought to be necessary for a person to enjoy the afterlife. In this activity, you will learn about the science behind the process of mummification by mummifying a hot dog. Read more

Expression Cloning

Science Fair Project Idea

Scientific Method

What is expression cloning and how is it used in the biotechnology industry? How are plasmids constructed for use in a bacterial expression system? You can investigate these questions and more using bacterial expression kits meant for high school classes. You will need a laboratory space equipped to grow bacteria and carry out simple molecular biology. A kit with plasmids and bacterial cells to transform are also needed. Here are two possibilities: BioBuilder What a Colorful World Kit … Read more

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