Statics is the action of one body on another. A force is either a push or a pull. A force tends to move a body in the direction of its action. The action of a force is characterized by its magnitude, by the direction of its action, and by its point of application. Thus, force is a vector quantity, because its effect depends on the direction as well as on the magnitude of the action. Forces are classified as either contact or body forces. A contact force is produced by direct physical contact; an example is the force exerted on a
Orders of magnitude (numbers) Orders of magnitude (numbers) This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantity and probabilities. Each number is given a name in the short scale, which is used in English-speaking countries, as well as a name in the long scale, which is used in some of the countries that do not have English as their national language. ISO: yocto- (y) ISO: zepto- (z) ISO: atto- (a) ISO: femto- (f) ISO: pico- (p) ISO: nano- (n) ISO: micro- (μ) ISO: milli- (m) ISO: centi- (c) ISO: deci- (d) ISO: deca- (da) ISO: hecto- (h) ISO: