Name the machine to which the door knob belongs.
The doorknob is an example of the wheel and axle.
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Amazon.com: Johnson Hardware Sliding Door/Pocket Door Hanger Ball Bearing 1125-1 Inch Wheel, 200 lb Capacity : Tools & Home Improvement
Why is a doorknob considered a wheel and axle? - Quora
Spoke Wheel Garrick Barn Door Hardware Kit | Rustica
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Why is a doorknob considered a wheel and axle? - Quora
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How doorknob is made - material, making, history, used, components, dimensions, composition, structure, steps
Brodie knob - Wikipedia
Are there more wheels or doors in the world? Why we can't resist an internet debate | Internet | The Guardian
The internet is arguing over whether there are more doors or wheels in the world
S&Z TOPHAND Paneled Wood Unfinished Barn Door with Installation Hardware Kit Big Wheel & Reviews | Wayfair
End the debate... Are there more doors or wheels? - BBC Newsround
How Doorknobs Work as a Simple Machine | Sciencing
Prime-Line Closet Door Roller with 1/2 in. Offset and 7/8 in. Nylon Wheel (2-pack) N 6501 - The Home Depot
Is A Door Knob A Wheel (March) All About Trending Debate
Custom Door Pulls - Ship Wheel Custom Door Hardware - Scottsdale Art Factory
Spoke Wheel Single/Double Barn Door Hardware Kit – Dusty's Rustic Rolling Doors
BAYTORY 3Pcs Screen Tool, Window Screen Spline Roller Tool with Wooden Handle and Steel/Nylon Bearing Wheels, Mesh Screen Door Repair Kit Durable and Easy to Use - Amazon.com
Large Wheel Barn Door Hardware Kit with Spoked 6" Nylon Wheels
Door Knob: an example of a wheel and axle by Hannah Caldwell
WinSoon 4-18FT Sliding Barn Door Hardware Double Doors Track Kit Black Wheel Style
