Fueling Up

Natural History | June 1, 2005| | Copyright

To travel from the Earth to the sky requires propulsion. Propulsion requires energy. Energy requires fuel.

In daily life you rarely need to think about propulsion, at least the kind that gets you off the ground and keeps you aloft. You can get around just fine without booster rockets-simply by walking, running, rollerblading, taking a bus, or driving a car. All those activities depend on friction between you (or your vehicle) and Earth's surface.

When you walk or run, friction between your feet and the ground enables you to push forward. When you drive, friction between the rubber wheels and ...

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