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Third Grade Science Projects (152 results)

Science Buddies' third grade science projects are the perfect way for third grade students to have fun exploring science, technology, engineering, and math (STEM). Our third grade projects are written and tested by scientists and are specifically created for use by students in the third grade. Students can choose to follow the science experiment as written or put their own spin on the project.

For a personalized list of science projects, third graders can use the Science Buddies Topic Selection Wizard. The wizard asks students to respond to a series of simple statements and then uses their answers to recommend age-appropriate projects that fit their interests.

Let us help you find a science project that fits your interests, with our Topic Selection Wizard.
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How to Turn a Potato Into a Battery
Science Fair Project Idea
Scientific Method
Imagine telling your friends about your latest science project: using a battery to make a light turn on. You might get some blank stares...sounds a little boring and basic, right? Now tell them you will do it with a potato! Yes, you can actually use fruits and vegetables as part of an electric power source! Batteries power many things around you, including cell phones, wireless video game controllers, and smoke detectors. In this science project, you will learn about the basics of battery… Read more
Build a Floating Maglev Train
Science Fair Project Idea
Scientific Method
How can you make a train without wheels? By using magnets! In this project you will build a magnetic levitation ("maglev" for short) train that floats above a magnetic track. How much weight can you add to the train before it sinks down and touches the track? Read more
2026 Ball Run Challenge
Science Fair Project Idea
Engineering Design Process
In this engineering challenge, you will build a ball run from paper and tape, but there's a twist! You want to make your ball run as slow as possible. How long can you make it take for the ball to get from the entrance to the exit?  Read more
How Far Will It Fly? Build & Test Paper Planes with Different Drag
Science Fair Project Idea
Scientific Method
Just one sheet of paper can lead to a whole lot of fun. How? Paper planes! All you have to know is how to fold and you can have a simple plane in a matter of minutes! But what design should you use to build the best plane? In this aerodynamics science project, you will change the basic design of a paper plane and see how this affects its flight. Specifically, you will increase how much drag the plane experiences and see if this changes how far the paper plane flies. There is a lot of cool… Read more
Make a "Whirlybird" from Paper
Science Fair Project Idea
Scientific Method
Have you ever seen a maple seed twirling as it falls through the air? In this project you will build something that behaves similarly called a whirlybird. Will your whirlybird be able to stay in the air as you add paper clips as weights? Try this project to find out! Read more
Turn Milk into Plastic!
Science Fair Project Idea
Scientific Method
"Plastic made from milk" —that certainly sounds like something made-up. If you agree, you may be surprised to learn that in the early 20th century, milk was used to make many different plastic ornaments —including jewelry for Queen Mary of England! In this chemistry science project, you can figure out the best recipe to make your own milk plastic (usually called casein plastic) and use it to make beads, ornaments, or other items. Read more
Slime Chemistry
Science Fair Project Idea
Scientific Method
Have you ever wondered how fun toys like Silly Putty®, Gak™, and Slime™ are made? These products are so much fun because of the properties of polymers, which make them delightfully bouncy, stretchy, sticky, moldable, breakable, hard, soft, and just plain fun! In this science project you can be the developer of your own slime product by changing the amount of a key ingredient. By observing the physical properties of your results, you can choose the best recipe for your new… Read more
How Salty Does the Sea Have to Be for an Egg to Float?
Science Fair Project Idea
Scientific Method
Some objects float on top of the ocean, and other objects sink to the bottom. Why? Try this eggsperiment to find out! Read more
Does Color Affect Taste?
Science Fair Project Idea
Scientific Method
You might have heard the saying "The eyes eat before the mouth." The appearance of food, especially its color, certainly affects how we perceive its taste. But can your eyes actually change the way you taste something? In this science project, you will find out by investigating how people perceive the taste of different colored apple juice. How do you think color affects taste? Read more
M&M Survival Challenge
Science Fair Project Idea
Scientific Method
In the wild there are two types of animals: the hunters and the hunted. A good predator is always on the prowl for fresh prey. What can an animal do to stay off of the menu? Some animals have evolved to use a variety of camouflage tactics so they can fool their predators and increase their chances of survival. In this science project, you will be the hungry predator hunting for M&M® prey. But it may not be as easy as it sounds — some of your prey will be camouflaged. Will they be… Read more
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