Feet per second
Encyclopedia
The foot per second is a unit of both speed
(scalar) and velocity
(vector quantity, which includes direction). It expresses the distance
in feet
(ft) traveled or displaced, divided by the time
in second
s (s, or sec). The corresponding unit in the International System of Units
(SI) is the metre per second
.
Abbreviations include ft/s, ft/sec and fps, and the rarely used scientific notation ft s-1.
Speed
In kinematics, the speed of an object is the magnitude of its velocity ; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as...
(scalar) and velocity
Velocity
In physics, velocity is speed in a given direction. Speed describes only how fast an object is moving, whereas velocity gives both the speed and direction of the object's motion. To have a constant velocity, an object must have a constant speed and motion in a constant direction. Constant ...
(vector quantity, which includes direction). It expresses the distance
Distance
Distance is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria . In mathematics, a distance function or metric is a generalization of the concept of physical distance...
in feet
Foot (unit of length)
A foot A foot A foot (plural: feet; abbreviation or symbol: ft or ′ (the prime symbol) is a unit of length in a number of different systems including Ancient Greek, Ancient Roman, English units, Imperial units, United States customary units and the units of many Continental European...
(ft) traveled or displaced, divided by the time
Time
Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....
in second
Second
The second is a unit of measurement of time, and is the International System of Units base unit of time. It may be measured using a clock....
s (s, or sec). The corresponding unit in the International System of Units
International System of Units
The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. The older metric system included several groups of units...
(SI) is the metre per second
Metre per second
Metre per second is an SI derived unit of both speed and velocity , defined by distance in metres divided by time in seconds....
.
Abbreviations include ft/s, ft/sec and fps, and the rarely used scientific notation ft s-1.