Let's take a look at what we've learned about Gravity, Weight, Volume, Mass, Density and the Power/Weight Ratio. First of all, why are these concepts important to the study of flight? Write a paragraph using all the terms to explain how these principles relate to model airplane flight. Then, we'll take a quiz to test your knowledge. After you take the quiz, research these questions on your own: Since the orbiting space station is in the Earth's gravitational field and is being pulled back to Earth, why are the astronauts weightless? If an astronaut weighs 175 lbs. on Earth because of the Earth's pull of gravity, what would that astronaut weigh on the moon being pulled by the moon's gravity? Why is there a difference? How much aluminum weight is there in a Boeing 747? What would that airplane weigh if it were made of steel rather than aluminum? .

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