Flight - Physics


There are different approaches to flight. If an object has a lower density than air, then it is buoyant and is able to float in the air without using energy. A heavier than air craft, known as an aerodyne, includes flighted animals and insects, fixed-wing aircraft and rotorcraft. Because the craft is heavier than air, it must generate lift to overcome its weight. The wind resistance caused by the craft moving through the air is called drag and is overcome by propulsive thrust except in the case of gliding.

Some vehicles also use thrust for flight, for example rockets and Harrier Jump Jets.

Finally, momentum dominates the flight of ballistic flying objects.

Read more about this topic:  Flight

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Famous quotes containing the word physics:

    He who is conversant with the supernal powers will not worship these inferior deities of the wind, waves, tide, and sunshine. But we would not disparage the importance of such calculations as we have described. They are truths in physics because they are true in ethics.
    Henry David Thoreau (1817–1862)

    ... it is as true in morals as in physics that all force is imperishable; therefore the consequences of a human action never cease.
    Tennessee Claflin (1846–1923)

    Now the twitching stops. Now you are still. We are through with physiology and theology, physics begins.
    Alfred Döblin (1878–1957)