Vertical TrajectoryObjects moving at high speeds through air encounter air drag proportional to the square of the velocity. Describing the motion of objects under this quadratic drag usually requires numerical techniques rather than straight analytic formuli since the drag force and the gravitational force are not acting along the same line. The case of the vertical trajectory can be treated analytically since the forces are colinear. It is common practice to express the velocity and time in terms of the terminal velocity v_{t} and a characteristic time τ. Two common approaches to the quadratic drag force are:

Index Fluid friction  

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Vertical Trajectory Calculation 
Index Fluid friction  

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