Rolling - online puzzles

Rolling

Rolling is a type of motion that combines rotation (commonly, of an axially symmetric object) and translation of that object with respect to a surface (either one or the other moves), such that, if ideal conditions exist, the two are in contact with each other without sliding.

Rolling where there is no sliding is referred to as pure rolling. By definition, there is no sliding when there is a frame of reference in which all points of contact on the rolling object have the same velocity as their counterparts on the surface on which the object rolls; in particular, for a frame of reference in which the rolling plane is at rest (see animation), the instantaneous velocity of all the points of contact (e.g., a generating line segment of a cylinder) of the rolling object is zero.

In practice, due to small deformations near the contact area, some sliding and energy dissipation occurs. Nevertheless, the resulting rolling resistance is much lower than sliding friction, and thus, rolling objects, typically require much less energy to be moved than sliding ones. As a result, such objects will more easily move, if they experience a force with a component along the surface, for instance gravity on a tilted surface, wind, pushing, pulling, or torque from an engine. Unlike cylindrical axially symmetric objects, the rolling motion of a cone is such that while rolling on a flat surface, its center of gravity performs a circular motion, rather than a linear motion. Rolling objects are not necessarily axially-symmetrical. Two well known non-axially-symmetrical rollers are the Reuleaux triangle and the Meissner bodies. The oloid and the sphericon are members of a special family of developable rollers that develop their entire surface when rolling down a flat plane. Objects with corners, such as dice, roll by successive rotations about the edge or corner which is in contact with the surface. The construction of a specific surface allows even a perfect square wheel to roll with its centroid at constant height above a reference plane.

Monorail station in Sentosa (Singapore) online puzzleKrakowskie Przedmiescie Street online puzzleLight reconnaissance FV101 Scorpion tank puzzle online from photoZlota Street puzzle online from photoCochabamba railway station (Bolivia) online puzzleEngine online puzzleBus and Taxi in London (England) online puzzleTrain at the train station in Kalmar (Sweden) puzzle online from photoNarrow-gauge steam engine puzzle online from photoHappy Wednesday! puzzle online from photoSteam Locomotive P-31652 online puzzleSmall railway station (United Kingdom) online puzzleNarrow-gauge locomotive L30H puzzle online from photoPlace of unloading containers puzzle online from photoMil Mi-24 puzzle online from photoKing Edward I locomotive online puzzleSuburban train in Moscow (Russia) puzzle online from photoSteam Locomotive Ol49 puzzle online from photoLight metro train in Moscow (Russia) puzzle online from photoDark green golf cart puzzle online from photoTGV train in Paris (France) online puzzleThe train station in Dallas (USA) puzzle online from photoWOŚP online puzzleElectric commuter train (Russia) online puzzle
London puzzle online from photoVintage peak on Victoria Peak (China) online puzzleFunicular in Lisbon (Portugal) puzzle online from photoRailbus (Bolivia) online puzzleKyrkö Mosse Car Graveyard (Sweden) puzzle online from photoPassenger train puzzle online from photoFunicular railway in Genoa (Italy) puzzle online from photoHistoric trams in Lisbon (Portugal) puzzle online from photoSteam locomotives in the Museum of Czech Railways (Czech Republic) online puzzleSide street in the district of Psiri in Athens (Greece) online puzzleValtra online puzzleTrain puzzle online from photoElectric locomotive online puzzleRailway track puzzle online from photoTarnów - Ol 49 steam locomotive 72 online puzzleMassey Ferguson 3060 online puzzleursus c3603p Faniwwe1 online puzzlesolaris police online puzzletrain puzzle online from photorailway viaduct puzzle online from photoLight rail in Phoenix (USA) online puzzleRailway station in Poznań (Poland) online puzzleSnow groomers online puzzleHistoric SN52 wagon puzzle online from photo