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Resources > Alex Jacobsen

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Orbital Speed: How Do Satellites Orbit?

Johannes Kepler, a German mathematician, was the first person to accurately describe the motions of the planets as being ellipses focused on the Sun. Isaac Newton, an English physicist, quickly proved ...

Reynolds Number: Laminar and Turbulent Flow

If you swirl water around in a cup, you’ll notice how easily and fast the water will move. But have you ever tried to swirl some maple syrup around in a cup? It doesn’t respond to your movements in th ...

The Candle Illusion: Virtual Images

Mirrors are strange things. They’re so common in our everyday lives that we often don’t think of how interesting they really are. Somehow they take the three-dimensional world we live in and represent ...

Balloon Rocket Experiment

You need to send a message to home from your tree house, but it’s too windy to send a paper airplane! Fortunately, you have a taut clothesline and a supply of balloons from last week’s birthday party. ...

Caffeine and Heart Rate: What Is the Effect of Caffeine on Heart Rate?

How do medical researchers study the effect certain drugs have on the human body? They make sure to conduct what’s called a blind study. A blind study is one where the people being tested have no idea ...

How Do the Phases of the Moon Affect the Tides?

You may have heard about how the Moon generates the tides. You may even know that high spring tides occur during a full or new Moon, and that low neap tides occur during a quarter Moon (when the Moon ...

How to Make Lightning

Have you ever wanted to be a mad scientist? Has your lack of control over lightning disheartened you? Never fear; this experiment will let you bend electricity to your will by showing you how to make ...

Magnetic Levitation

Magnets. How do they work? It’s not a miracle, even though magnets may seem like mysterious things. They push and pull certain —and can even make them levitate—without touching them at all, but they s ...

Plane Mirror Reflection Experiment

Plane (flat) mirrors have a reflective surface that bounces back light within 180 degrees of the mirror's face. We use these mirrors every day in our bathrooms, bedrooms, and cars. When you look in a ...

Potato Chip Science: How Greasy Are Your Potato Chips?

Potato chip science is big business! The FDA (Food and Drug Administration) does some very important tests so that the food you eat—including potato chips—is accurately labeled. We may not have access ...

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