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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, ...
Roller skating is the act of travelling on surfaces with roller skates. It is a recreational activity , a sport, and a form of transportation. Roller rinks and skate parks are built for roller skating, though it also takes place on streets, sidewalks, and bike paths .
Roller skates are shoes or bindings that fit onto shoes that are worn to enable the wearer to roll along on wheels. The first roller skate was an inline skate design, effectively an ice skate with wheels replacing the blade.
Roller derby is a roller skating contact sport played on an oval track by two teams of five skaters. It is played by approximately 1,250 amateur leagues [note 1] worldwide, though it is most popular in the United States. [2] A 60-minute roller derby game, or bout, is a series of two-minute timed jams.
Roller bearings are the earliest known type of rolling-element-bearing, dating back to at least 40 BC. Common roller bearings use cylinders of slightly greater length than diameter. Roller bearings typically have a higher radial load capacity than ball bearings, but a lower capacity and higher friction under axial loads.
Caterpillar soil compactor equipped with padfoot drum, being used to compact the ground before placing concrete Antique "Kemna" steamroller. A road roller (sometimes called a roller-compactor, or just roller [1]) is a compactor-type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations. [1]
A steamroller (or steam roller) is a form of road roller – a type of heavy construction machinery used for leveling surfaces, such as roads or airfields – that is powered by a steam engine. The leveling/flattening action is achieved through a combination of the size and weight of the vehicle and the rolls : the smooth wheels and the large ...
A Hybrid rolling pin design that combines the features of Rod and Roller pins by Rolling Wonder. A wooden "roller" type rolling pin Atta dough being rolled with a rolling pin during the preparation of chapati. A rolling pin is a cylindrical food preparation utensil used to shape and flatten dough. Two styles of rolling pin are found: rollers ...