Natural dihedral
Can you help me with this:
A body of mass $m$ is moving under gravitational force and resistance
force proportional to the square of its speed. Write differential
equations of motion of a body in vertical plane using natural dihedral -
unit tangent vector $\vec e_t$ and normal vector $\vec e_n$.
Hint: Use speed $v$, angle $\theta=\angle (\vec i,\vec e_t)$ and
coordinates $x,y$ as a state variable.
I know I have to write equation for Newton's Second Law but I am confused
about "natural dihedral".
I think it would be enough if somebody could draw a picture for this. Thanks!
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