6.1 Introduction

Curvilinear motion:

• Dynamics of vehicles (cars, planes, ...)
• Ballistics,
• Forces,
• Vortex lines,
• ...

$$\vec r = \vec r(t) \qquad \vec v = \frac{{\rm d}\vec r}{{\rm d}t} \qquad \vec a = \frac{{\rm d}\vec v}{{\rm d}t}$$