High School Science Experiments (Page 150)

How Fast is Automatic Braking?

Science Fair Project Idea

Scientific Method

How fast can a human driver react and hit the brakes when there is an obstacle in the road? Can autonomous cars react more quickly and make the road safer for everyone? In this project you will build your own Arduino robot and test human braking versus automatic braking as the robot drives toward an obstacle at full speed. Read more

How Fatigue Changes Balance

Science Fair Project Idea

Scientific Method

Balance is one of the most important parts of how our bodies work. Even standing still requires the brain, muscles, eyes, and inner ears to coordinate perfectly. But what happens when you get tired—even just a little bit—from something like dancing, running, jumping in place, or doing step-ups for a short period of time? Many scientific studies show that fatigue—both mental and physical—can make balance worse. For example, after short bursts of physical activity, people… Read more

How Food Supplements Affect Weight Gain of Juvenile Mice

Science Fair Project Idea

Scientific Method

As your mom and dad always tell you, a healthy diet is important to good health. This project is designed to see what happens to mice when they are allowed to load up on sugary snacks. Do you think that they will gain excess weight? Do you think that the mice will regulate their own intake and maintain a 'healthy' diet? You can try this project and find out for yourself. Read more

How Heavy Is Your Air?

STEM Activity

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If you’ve ever accidentally let go of a Helium balloon while outside, then you know that some gases are less dense than others. In the case of your Helium balloon, it most likely floated away before you could catch it, because Helium is much lighter (or less dense) than the air in our environment. We don’t often think about gases having density, but they do! In this activity you’re going to explore the different densities of some common household gases, including the air that… Read more

How Long Will My Sleepy Yo-yo Sleep?

Science Fair Project Idea

Scientific Method

Sometimes, simple toys can be quite complicated. Take the yo-yo. It's a fun toy and there is nothing simpler than a string wrapped between two connected disks. But there's a lot of physics that makes a yo-yo work. In this science fair project, learn more about how and why a yo-yo works. You will investigate the effect of string length on the yo-yo's "sleep" trick time. If people ask why you've got a yo-yo with you all the time, tell them that while it looks like you're just having fun, you're… Read more

How Many Cranks Does It Take to Power a Hand-Cranked Radio?

Science Fair Project Idea

Scientific Method

If you lose power, you can probably still access the internet and read the news with a cell phone. But what if the power goes out for so long that your phone battery dies, or if cellular service also goes down? How would you get news from the outside world? In emergencies, you can use a hand-crank radio, which is powered by manually turning a crank. But just how much power do you get when you turn the crank? How long will the radio stay on before you need to charge it again? Try this project to… Read more

How Many Seeds Do Different Types of Fruit Produce?

STEM Activity

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Do you like your strawberry jelly with or without the seeds? Are you glad to have a seed-free watermelon, or do you enjoy spitting the seeds into the garden? You might not like finding seeds in your fruit, but fruit is a plant's tool for dispersing seeds to create offspring. In this activity you will investigate how many seeds can be dispersed for each type of fruit. Based on the number of seeds they produce, how productive do you think some of your favorite fruits are? … Read more

How Much Do Different Pet Species Eat Compared to Each Other?

Science Fair Project Idea

Scientific Method

Are you in charge of feeding your family pet? How much food do you think your pet eats compared to other kinds of pets? After adjusting for your pet's body weight, you might be surprised how it will compare to other kinds of pets. What type of pet do you think will eat the most for its body weight? Read more

How Much Weight Can Your Sandcastle Hold?

Science Fair Project Idea

Scientific Method

Do you think a sandcastle can support a brick? How can you change a sandcastle to make it support more weight? Find out in this fun science project! Read more

How Particle Size Determines Chemical Reaction Rate

STEM Activity

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Did you know that flour can explode? Luckily, this does not happen spontaneously on your kitchen counter, but only if the conditions are right. The trick is that you need a very fine powder of flour to make an explosion happen. In fact, any solid flammable material that is dispersed in the air as a dust cloud will explode once it is ignited. Why is that? It has to do with the particle size of the solid material, which determines how rapidly a chemical reaction takes place. In this activity, you… Read more

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