How Do Birds Fly?
How Do Birds Fly? Most birds are well suited for flying. First of all, a bird has feathers and wings, and powerful muscles in its breast with which to flap them. A...
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What Makes a Ship Float?
What Makes a Ship Float? A small steel ball dropped into water sinks immediately. A ship weighs thousands of tons, yet it floats on the ocean’s surface. A ship...
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What Is Gravity?
When you toss a ball into the air, it comes down because it is pulled to earth by gravity. Gravity is a force that pulls all things on the earth toward the...
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What Are Scales and How Do They Work?
What Are Scales and How Do They Work? Scales are valuable tools that help us keep track of our weight. In addition to doctors’ offices, you’ll also find...
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How Does a Dam Produce Electricity?
How Does a Dam Produce Electricity? Much of the electricity we use is produced by power plants located in huge dams. Such plants, called hydroelectric plants, are run...
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