What Is the Law of Inertia?
Hundreds of years ago, scientists made simple observations and believed that the natural state of an object was to be at rest. It seemed o
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Motion
What Is Energy?
Energy is the power to act. There are several different forms of energy, and one kind can be changed into another kind. But although it can
What Makes a Boomerang Come Back?
It is the built-in skew or twist in a boomerang combined with its spinning motion that makes it return to the thrower. At first people belie
Who Invented the Wankel Engine?
Felix Wankel, a German motor engineer, invented the rotary piston engine which bears his name. Deprived of a university education when his f
How Do Automatic Doors Work?
Doors — known as automatic doors — open and close with the help of simple technology, they operate with the help of sensors. Sensors do