Torque Torque Torque, moment, or moment of force is the rotational equivalent of linear force. The concept originated with the studies of Archimedes on the usage of levers. Just as a linear force is a push or a pull, a torque can be thought of as a twist to an object. The symbol for torque is typically formula_1, the lowercase Greek letter "tau". When being referred to as moment of force, it is commonly denoted by "M". In three dimensions, the torque is a pseudovector; for point particles, it is given by the cross product of the position vector (distance vector)
Metrication in the United States SI is widespread for many applications. Residential electric power plans use kilowatt hours. The luminous flux from lamps is specified in lumens rather than candlepower. The letter "K" is commonly used to denote "thousand" (e.g., "She earns $80K"), even though this is inconsistent with the lowercase "k" in SI. This usage has largely replaced the letter "G" (for "grand", used almost exclusively for money) and the Roman numeral "M" that was commonly used for "thousand" before the 1960s; in fact, the "M" has now come to denote "million" (e.g., "$32.5M budget"). Televised and radio weather reports are given in degrees