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Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. [7] [8] Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces. [9] [10] [11] Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.
Tribology is the science and engineering of understanding friction, lubrication and wear phenomena for interacting surfaces in relative motion.It is highly interdisciplinary, drawing on many academic fields, including physics, chemistry, materials science, mathematics, biology and engineering. [1]
Urdu was chosen as a symbol of unity for the new state of Pakistan in 1947, because it had already served as a lingua franca among Muslims in north and northwest British India. [17] It is written, spoken and used in all provinces/territories of Pakistan , and together with English as the main languages of instruction, [ 18 ] although the people ...
Traction can also refer to the maximum tractive force between a body and a surface, as limited by available friction; when this is the case, traction is often expressed as the ratio of the maximum tractive force to the normal force and is termed the coefficient of traction (similar to coefficient of friction).
The number of Urdu speakers in India fell 1.5% between 2001 and 2011 (then 5.08 million Urdu speakers), especially in the most Urdu-speaking states of Uttar Pradesh (c. 8% to 5%) and Bihar (c. 11.5% to 8.5%), even though the number of Muslims in these two states grew in the same period. [128]
File:Linear friction-1.svg is a vector version of this file. It should be used in place of this PDF file. ... 11:26, 25 April 2018: 370 × 258 (25 KB ...
Pakistan holidays are celebrated according to the Islamic or local Pakistani calendars for religious and civil purposes, respectively. Religious holidays such as Eid are celebrated according to the Islamic calendar whereas other national holidays such as Labour Day, [1] Pakistan Day, Independence Day, and Quaid-e-Azam Day are celebrated according to the Gregorian calendar.