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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 ...

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. ...

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 ...

Inverse Square Law: How Does Distance Affect the Spreading of Light?

You’re sitting under a tree on a sunny day. There are bright circles of light of light from the sun making chaotic patterns on the grass. Where do you suppose they come from? How does distance affect ...

Changing the Period of a Pendulum

Imagine that your plane has crash landed on a desert island. You don’t have a working clock, so you can’t tell when afternoon teatime is! You set out to make yourself a clock. The plane was carrying a ...

What Direction Should Solar Panels Face?

Imagine you’re installing a new array of solar panels for an energy-conscious company in California. You want the largest amount of sunlight possible to reach the panels. The panels are fixed, so you ...

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