Inch per second

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The inch per second is a unit of speed or velocity. It expresses the distance in inches (in) traveled or displaced, divided by time in seconds (s, or sec). The equivalent SI unit is the metre per second .

Speed magnitude of velocity

In everyday use and 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 travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

Velocity rate of change of the position of an object as a function of time, and the direction of that change

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

Distance is a numerical measurement of how far apart objects are. In physics or everyday usage, distance may refer to a physical length or an estimation based on other criteria. In most cases, "distance from A to B" is interchangeable with "distance from B to A". In mathematics, a distance function or metric is a generalization of the concept of physical distance. A metric is a function that behaves according to a specific set of rules, and is a way of describing what it means for elements of some space to be "close to" or "far away from" each other.


Abbreviations include in/s, [1] in/sec, ips, [1] and less frequently in s−1.


1inch per second is equivalent to:

=0.0254 metres per second (exactly)
=112 or 0.083 feet per second (exactly)
=588 or 0.05681 miles per hour (exactly)
=0.09144 km·h−1 (exactly)

1 metre per second ≈ 39.370079inches per second (approximately)
1 foot per second = 12inches per second (exactly)
1 mile per hour = 17.6inches per second (exactly)
1 kilometre per hour ≈ 10.936133inches per second (approximately)

The metre per second is an SI derived unit of both speed (scalar) and velocity, defined by distance in metres divided by time in seconds.

The foot per second is a unit of both speed (scalar) and velocity. It expresses the distance in feet (ft) traveled or displaced, divided by the time in seconds. The corresponding unit in the International System of Units (SI) is the metre per second.


In magnetic tape sound recording, magnetic tape speed is often quoted in inches per second (abbreviated "ips").

Magnetic tape medium for magnetic recording

Magnetic tape is a medium for magnetic recording, made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on magnetic wire recording. Devices that record and play back audio and video using magnetic tape are tape recorders and video tape recorders respectively. A device that stores computer data on magnetic tape is known as a tape drive.

Also computer mice sensitivity is also often referred to in inches per second (abbreviated as "ips") along with g force.

In rotorcraft health monitoring, rotor and shaft induced vibration levels are often quoted in inches per second.

See also

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  1. 1 2 "Velocity Units: Inch Per Second". efunda. Retrieved 2011-12-27.