Brushed DC motor speed-torque curve (Kevin Lynch)

For more information, see nu32.org. This video is a supplement to the book "Embedded Computing and Mechatronics with the PIC32 Microcontroller," Lynch, Marchuk, and Elwin. It is part of Northwestern University's ME 333 Introduction to Mechatronics.
L-comp: Explain why the boundary between the continuous operating region and the intermittent operating region is a vertical line.