Seventh Grade Science Experiments (Page 176)

What Bone Do Children Break Most Often, and What Is the Main Cause?

Science Fair Project Idea

Scientific Method

Here's a project that will give you insight into accidents, and maybe help you prevent them. The original project used a survey method to gather data, which you could also do. Another approach for data collection that you might try would be to use published articles from the pediatric medical literature. Finding a pediatrician or pediatric orthopedist who is willing to be your mentor for this project would be helpful. (Idea from Caito, 2003) Read more

What Electric Bills Can Tell You About Energy Use

Science Fair Project Idea

Scientific Method

This project is a great way to "bring home" the concept of energy use. All you need to get started is a good-sized sample of monthly electric bills from households in your area. Building from this simple beginning, you can ask questions that can take you in many different directions. For example: How much electricity does the "average" person in your area use per month? How much does electricity use vary among different families? Read more

What is the Cheapest Way to Launch Payloads into Space?

Science Fair Project Idea

Engineering Design Process

A mass driver is a proposed device that could launch payloads into space using a long tube lined with electromagnets (Figure 1). Some scientists argue that such a launch system would offer long-term cost savings over the use of chemical rockets. Scientists have proposed theoretical electromagnetic launcher designs as far back as the 1970s (O'Neill 1979). More recently, some have proposed the use of railguns originally developed for the U.S. Navy (McNab and McGlasson 2022). Other types of… Read more

What is the Most Effective Treatment for Whitefly Infestations on Plants?

Science Fair Project Idea

Scientific Method

Whiteflies are a group of closely related insect species whose larvae live on plants. Like aphids, they suck nutrients from the plant's circulatory system. What is the most effective method for fighting a whitefly infestation in your garden? This project has some ideas for you to try. Read more

What Makes a Good Aerodynamic Design? Test Your Ideas with High-Performance Paper Gliders

Science Fair Project Idea

Scientific Method

You have probably made plenty of regular paper airplanes simply by folding a piece of printer or notebook paper. Have you ever tried making a "high performance" paper glider? These gliders use a different construction technique that involves cutting multiple shapes out of thicker, stiffer paper and gluing them together (this process is called lamination). There are many resources online that can get you started with the art of making high performance paper gliders. See the references in the… Read more

What Material Makes the Most Resonant Soundboard?

Science Fair Project Idea

Scientific Method

If you like music and musical instruments, here is a project that might resonate with you! This is a fun experiment to investigate materials that could be used to build acoustic musical instruments. You can use a music box mechanism and a sound level meter to see which materials make the best soundboards. Read more

What's the Best Way to Guarantee Fresh Bread?

Science Fair Project Idea

Scientific Method

Have you ever bitten into a slice of bread only to find that it no longer seems fresh? Instead, it has the firm, undesirable texture that comes about when the bread is going stale. Chemically, what happens during the staling process? Can it be reversed (at least temporarily)? Do some background research to answer these questions and then apply those answers to one (or more) of the following experiments to find the optimal state to keep your bread fresh. Experiment 1: What Temperature Keeps… Read more

What's the Fastest Way to Sort a List?

Science Fair Project Idea

Scientific Method

Imagine that you have a list of names of all the people in your class. Someone asks you to put them in alphabetical order. How would you go about doing it? Would you first go through the entire list and look for all the "A" names? Then go through it again and look for all the "B" names, and so on? Do you think going through the list over and over again for each letter would be inefficient? What if you had hundreds, thousands, or even millions of names? How would you ever alphabetize them… Read more

When the Sun Rises: The Effect of Light on the Movement of Daphnia

Science Fair Project Idea

Scientific Method

Changes in the environment, or stimuli, affect your behavior and movement over the course of a day: When you get cold, for instance, you might get up and put on a sweater. Or if it is sunny and warm, you might go outside to play sports or go for a walk. Different stimuli, including light, affect the movement of other organisms as well. But how does the type of light influence their movement? Do they respond differently to different kinds of light, depending on other factors in their… Read more

Where Do Lizards Go for Lunch?

Science Fair Project Idea

Scientific Method

You've probably heard about differences between the left brain and the right brain in people. Did you ever wonder where that came from? Do other animals have specialized brain hemispheres too? One hypothesis has it that brain lateralization evolved as a survival mechanism in animals with eyes on the sides of their heads. One eye could focus on finding food, while the other watched out for predators. This project tests that hypothesis by looking for left-right bias in feeding behavior in lizards. Read more

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