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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A swivel caster. A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment.

3. Caster angle - Wikipedia

   en.wikipedia.org/wiki/Caster_angle

   The caster angle [1] or castor angle [2] is the angular displacement of the steering axis from the vertical axis of a steered wheel in a car, motorcycle, bicycle, other vehicle or a vessel, as seen from the side of the vehicle. The steering axis in a car with dual ball joint suspension is an imaginary line that runs through the center of the ...

4. Scenery wagon - Wikipedia

   en.wikipedia.org/wiki/Scenery_wagon

   Scenery wagon. A scenery wagon, also known as a stage wagon, is a mobile platform that is used to support and transport movable, three-dimensional theatrical scenery on a theater stage. In most cases, the scenery is constructed on top of the wagon such that the wagon, and the scenery it supports, forms a single, integrated structure.

5. Wheel - Wikipedia

   en.wikipedia.org/wiki/Wheel

   An early wheel made of a solid piece of wood A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportation while supporting a load, or ...

6. Shopping cart - Wikipedia

   en.wikipedia.org/wiki/Shopping_cart

   A shopping cart held by a woman, containing bags and food. A shopping cart (American English), trolley (British English, Australian English), or buggy (Southern American English, Appalachian English), also known by a variety of other names, is a wheeled cart supplied by a shop or store, especially supermarkets, for use by customers inside the premises for transport of merchandise as they move ...

7. Roller coaster - Wikipedia

   en.wikipedia.org/wiki/Roller_coaster

   Roller coaster. The Scenic Railway at Luna Park, Melbourne, is the world's second-oldest operating roller coaster, built in 1912. A roller coaster is a type of amusement ride employing a form of elevated railroad track that carries passengers on a train through tight turns, steep slopes, and other elements usually designed to produce a ...