Fourth Grade Science Experiments (Page 68)

Give It a Lift with a Lever

Science Fair Project Idea

Scientific Method

Did you know that you can lift an object that's heavier than you are? Just use a lever! In this science project you'll build a tabletop lever and measure how much effort it takes to lift an object using it. Read more

Give Yourself a Lift: Lightening the Load with Pulleys

Science Fair Project Idea

Scientific Method

Before the Industrial Age, people relied on muscle power for moving and lifting heavy objects. Here's a project that shows you how you can use your head to make heavy lifting easier on your muscles–and your back! Read more

Going Green as You Clean: Are 'Green' Detergents Less Toxic Than Conventional Detergents?

Science Fair Project Idea

Scientific Method

There is strong interest in "going green," including using products that cause less environmental damage when they are disposed of. In this environmental sciences project, you will compare the toxicity of "green" and conventional liquid detergents using worms as test organisms. Read more

Gravity-Powered Sorting Machine

STEM Activity

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23 reviews

Have you ever used a coin-sorting machine to separate pennies, nickels, dimes, and quarters? When you need to separate things that are all mixed together, using a machine can be much faster than picking them apart by hand. In this project you will build a machine that can automatically separate two different size marbles, powered by nothing but gravity. Read more

Growing Great Gardens: Using Human Urine as a Fertilizer

Science Fair Project Idea

Scientific Method

Every day farmers around the world apply commercial fertilizer to their fruits and vegetables to improve plant health and yield. But applying commercial fertilizer is expensive and not economically possible for some farmers in developing countries. What if they could find a way to fertilize plants cheaply? It turns out that human urine is rich in the nutrients that plants need to grow. Could urine serve as a fertilizer substitute? Find out for yourself in this plant growth science project. Read more

Have a Cricket Tell You the Temperature!

STEM Activity

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Do you love to hear the pulsing chirp of crickets as you fall asleep? It is an unmistakable sound. Some people find the sound pleasing and peaceful, but other people find the sound loud and annoying, especially if a cricket happens to get inside a home to escape the cold. However you feel about crickets, their chirps hold a surprising message — they can be used to predict the temperature! In this science activity, you will investigate how the chirps of these tiny creatures can be used… Read more

Homemade Rice Paper

STEM Activity

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Have you ever encountered "paper" on your plate—perhaps in the form of thin paper for spring rolls, or cake decorating? Did it make you wonder how this paper relates to the paper you write on? You will find out in this activity! In addition, you can discover the recipe to make the edible paper you like best. Read more

How Bright Is Your Glow Stick? Measure It!

Science Fair Project Idea

Scientific Method

Objects that glow in the dark hold a special place in the imagination of both children and adults. The lights go out at night, but these odd things refuse to disappear. Where does the light come from? Do they work in any climate? In this science fair project, you will make a very simple electronic device to measure the light given off by luminescent materials. The device will be used to study how temperature affects luminescence. Read more

How Dirt Cleans Water

STEM Activity

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Did you know that more than half of the bottled water sold in America is labeled as “spring water,” but only a fraction of this water naturally flowed from a spring? The FDA allows the sale of groundwater that is sucked up by hydraulic pumps that are installed close to a spring as “spring water.” In the year 2014, this was about six billion gallons of water, a number that increases each year. That is a lot of water! You might wonder how water is stored under the ground,… Read more

How Do Arctic Animals Stay Warm?

STEM Activity

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How lovely it is to come home after a chilly winter walk to a cozy house, put on your fluffy slippers, and settle by the fireplace with a warming cup of hot chocolate. Animals like the polar bear, the Arctic wolf, or Antarctic penguins are not so lucky to have such a place. How do they face the extreme winter temperatures? Most take on “winter coats” in the fall. Wondering what these coats look like, and how they help keep animals warm? Do this cool activity and you will feel it… Read more

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