Radial Direction

Transverse Direction


In the previous chapter, the Curvilinear Motion: Polar Coordinates section developed expressions for acceleration in polar coordinates,


Using this representation of acceleration, Newton's Second Law can be expressed in terms of polar coordinates, giving

    ΣFrer + ΣFθeθ = m (arer + aθeθ)

The full relationship is:


Or, each of the two directions can be separated, giving



Practice Homework and Test problems now available in the 'Eng Dynamics' mobile app
Includes over 400 problems with complete detailed solutions.
Available now at the Google Play Store and Apple App Store.