Ninth Grade Science Experiments (Page 181)

Attractants and Repellants

Science Fair Project Idea

Scientific Method

Animals respond to chemical cues in different ways. If an animal turns away from a chemical cue, then that chemical is a repellent. If an animal turns toward a chemical cue, then that chemical is an attractant. Attractants and repellents can be airborne chemicals, chemicals found in food, or chemicals that diffuse through water. One example of an airborne chemical is a pheromone, a chemical signal that is released by one individual to attract another. Moths release pheromones to attract… Read more

Automatic Drone Balancing

STEM Activity

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10 reviews

How do drones automatically balance themselves when you let go of the controls? Find out in this project as you build and program an experimental setup to make a drone automatically control its tilt angle about a single axis. See this page for a complete list of our mini drone projects. You may wish to do the projects in order. Read more

Awesome Summer Science Experiments

Blog Post

From the Vault!: This summer science series is from 2021 and features ten free weeks of Awesome Summer Science projects and experiments for kids to do at home, in a summer program, or in a formal learning environment. Ten Weeks of Awesome Summer Science Experiments! For many families, summer days leave kids with lots of freeform time to fill! Right alongside arts and crafts, it can be easy to explore science and engineering! Hands-on STEM is a great way for kids to unplug and make, build,… Read more

Back and Forth to Go Forward: A Snake on Wheels?

Science Fair Project Idea

Scientific Method

Have you ever ridden on a Roller Racer® or PlasmaCar®? These are ride-on toys that you move ahead by moving the steering mechanism back and forth. You've probably seen skateboarders "slaloming" on level ground to keep rolling, it's basically the same idea. This project explores the physics behind this method of locomotion. Read more

Background Bop: Do Different Businesses Play Different Tempos in Background Music?

Science Fair Project Idea

Scientific Method

Walk into a fitness club and what kind of music do you hear? Slow, sparkling, relaxing music? Or driving, "up-tempo" songs that are designed to encourage you to move? Fitness clubs and other businesses, like restaurants and grocery stores, use background music to set the mood and to determine how fast they want their customers to move. The tempo of the background music is a key component to the environment that businesses want to create. Tempo is an important number or word inscribed by a… Read more

Backyard Science: Summer of STEM (Week 10)

Blog Post

Join Science Buddies this summer for virtual summer camp! Each week, we'll have a fun STEM theme for kids of all ages, suggestions for simple hands-on activities, book picks, and more. With our Summer of STEM, we'll keep you and your kids inspired all summer with creative and innovative science and engineering activities — for free. This week: birds, bugs, flowers, weather, and other backyard science investigations! Backyard Science This week,… Read more

Baking Soda Bubbles and the Science of Sour

Blog Post

In this family STEM activity, students use baking soda to help detect the presence of acids in foods and explore the relationship between acidity and whether or not a food tastes sour. A Simple Test for Sour When you eat or drink something, your taste buds detect qualities like sour, sweet, and bitter. If you drink pickle juice, you might immediately describe it as sour. The same would be true for lemon juice. But a food or drink that also contains ingredients that counter (or mask)… Read more

Baking Soda Weight Loss

STEM Activity

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Baking soda is not only great for cooking; it is also a useful chemical for science projects. You have probably heard about and maybe even used the baking soda/vinegar reaction to make volcanos erupt, shoot bottle rockets up in the air, or to detect acids and bases. However, there are many more chemical reactions that you can explore with the help of baking soda. One of them is called a decomposition reaction, which makes baking soda lose weight! Want to find out how it works? Then try this… Read more

Balancing Act

STEM Activity

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What makes an object balanced? Look around you—most of the objects in the room are probably balanced and not on the verge of tipping over. If someone hands you an object and asks you to put it down, you probably know, without thinking about it too much, how to place it so it won't fall over. But what's the science behind how an object balances? Why do certain objects only balance on some sides and not others? Try this project to find out! Read more

Barometric Pressure and Weather

Science Fair Project Idea

Scientific Method

How does temperature change as barometric pressure changes? You can make a device to test this using a barometer and a thermometer on your stovetop. You can collect your own weather data from a barometer and thermometer over a period of a week or month. You can also use data from a weather station to plot the relationship between barometric pressure and temperature. Does the pressure change as humidity changes? Measure the pressure in a humid and non-humid environment (like your bathroom… Read more

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