Horizontal+surface
121Support polygon — For a rigid object in contact with a fixed environment and acted upon by gravity in the vertical direction, its support polygon is a horizontal region over which the center of mass must lie to achieve static stability. For example, for an object… …
122Ice core — An ice core is a core sample from the accumulation of snow and ice over many years that have re crystallized and have trapped air bubbles from previous time periods. The composition of these ice cores, especially the presence of hydrogen and… …
123Rolling resistance — Figure 1  Hard wheel rolling on and deforming a soft surface, resulting in the reaction force from the surface having a component that opposes the motion. Rolling resistance, sometimes called rolling friction or rolling drag, is the… …
124Steel square — Carpenter s square redirects here. For the plant, see Scrophularia marilandica. The steel square is a tool that carpenters and other tradesmen use. Today the steel square is more commonly referred to as the framing square. It consists of a large… …
125Focke-Wulf Ta 183 — infobox Aircraft name = Ta 183 Huckebein type = Fighter manufacturer = Focke Wulf caption = Wind tunnel model designer = Kurt Tank first flight = introduced = retired = produced = number built = None completed status = Teminated by end of war… …
126El Lissitzky — Infobox Person name =El Lissitzky image size =200px caption = El Lissitzky in a 1924 self portrait birth date = November 23, 1890 birth place = Pochinok death date = December 30, 1941 death place = Moscow occupation = ArtistAudio|ru El… …
127level — noun 1》 a horizontal plane or line with respect to the distance above or below a given point. 2》 a height or distance from the ground or another base. ↘a floor within a multi storey building. 3》 a position or stage on a scale of quantity,… …
128level — I. a. 1. Horizontal. 2. Even, flat, plain. 3. Flush, on a level, of the same height. 4. Of the same rank, condition, etc., on a par. II. v. a. 1. Make horizontal. 2. Bring to the same level …
