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A woman sits on a stool that can turn friction-free about its vertical axis. She is handed a spinning bicycle wheel that has angular momentum 0 and she turns it over (that is, through 180º) . She thereby acquires an angular momentum of magnitude
5th Wheel
A pivoting plate attached to a vehicle's chassis (like those on semi-trucks) that enables the attachment and swivel motion of a trailer or similar component.
Locking Mechanism
A device or system designed to prevent movement or separation by securing components in place, commonly used in various types of machinery and equipment.
Drawbar Eye
The coupling eye that engages to either a pintle hook or the shank below a heavy-duty ball hitch assembly.
A-train Combination
A specific truck and trailer arrangement where a standard tractor pulls a semi-trailer which is connected to a "pup" trailer by a converter dolly, used to increase cargo capacity.
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