The one part slows down because of the brake band, which loops over that element.
From the en.wikipedia.org
With the engine off, this brake band acting on the rear unit ring gear had a tremendous mechanical advantage.
From the en.wikipedia.org
The tighter the brake band is, the more pull on the yarn, because the more friction the bobbin has to overcome in order to turn in sync with the flyer.
From the en.wikipedia.org
The previously mentioned parking brake lever operated band brakes on the outside of the rear brake drums.
From the en.wikipedia.org
While the bike is cruising the LEDs can display, say, the name of a band, but when the biker slows down they become brake lights.
From the newscientist.com
The central bank has stepped on the brake to try to bring inflation, pushed up to 8.6% in December by rising oil and food prices, back into the 3-6% target band it left last April.
From the economist.com
All the Government needed to do was accelerate the FITs tariff band regression from the 7% planned to a higher figure if it felt the need to put a brake on hot money flooding in to solar farms.