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The main way that nature is seen in nature is through the
use of gravity. When an object is propelled upward it follows a parabolic
curve back to earth. |
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The curve of a projectile such as a cannonball follows a
parabolic curve to its destination. |
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An antenna also uses a parabolic curve. The beam comes
toward the parabolic surface and is brought into focus at the focal point. |
 | The equation of a parabola on a horizontal vertex is 4px = y2. |
| The equation of a parabola on a vertical vertex is 4py = x2. |
p = distance from vertex to focus (or directrix)
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