## Tangential and normal components

vector can be decomposed uniquely as a sum of two vectors, one tangent to the curve, called the **tangential** component of the vector, and another one perpendicular to the curve, called the **normal** component of the vector. Similarly a vector at a point on a surface can be broken down the

**wikipedia.org**| 2011/3/11 10:55:17

## Angular velocity

Angular velocity vector for a frame 2.1.1 Addition of angular velocity vectors in frames 2.1.2 **Components** from the vectors of the frame 2.1.3 **Components** from Euler angles 2.1.4 **Components** from infinitesimal rotation matrices 2.2 Angular velocity tensor 2.3 Properties of angular

**wikipedia.org**| 2011/8/4 5:29:05

## Tangential angle

In geometry , the **tangential** angle of a curve in the Cartesian plane, at a specific point, is the angle between the tangent line to the curve at the given point and the x -axis. [ 1 ] (Note, some authors define the angle as the deviation from the direction of the curve at some fixed starting

**wikipedia.org**| 2010/9/25 7:44:44

## Ex-tangential quadrilateral

In geometry , an ex **tangential** quadrilateral is a convex quadrilateral where the extensions of all four sides are tangent to a circle outside the quadrilateral. [ 1 ] It has also been called an exscriptible quadrilateral . [ 2 ] The circle is called its excircle or its escribed circle

**wikipedia.org**| 2011/8/29 4:26:10

## Euclidean vector

In elementary mathematics , physics , and engineering , a Euclidean vector (sometimes called a geometric [ 1 ] or spatial vector , [ 2 ] or – as here – simply a vector) is a geometric object that has both a magnitude (or length ) and direction. A Euclidean vector is frequently represented

**wikipedia.org**| 2011/9/22 12:34:44

## Centrifugal force (planar motion)

In classical mechanics , centrifugal force (from Latin centrum "center" and fugere "to flee") is one of the three so-called inertial forces or fictitious forces that enter the equations of motion when Newton's laws are formulated in a non-inertial reference frame . The other two fictitious

**wikipedia.org**| 2010/9/25 3:03:54

## Stress (mechanics)

force per square inch , which is abbreviated as psi. Contents 1 Introduction 1.1 **Normal** and shear stresses 1.2 Stress modeling (Cauchy) 1.3 Stress analysis 2 Theoretical background 3 Euler–Cauchy stress principle 3.1 Cauchy’s postulate 3.2 Cauchy’s fundamental

**wikipedia.org**| 2011/5/18 18:35:03

## Orthogonal coordinates

that the orthogonality of the curved grid is retained. equal the square roots of the diagonal **components** of the metric tensor, or the lengths of the local basis vectors described below. These scaling functions h i are used to calculate differential operators in the new coordinates, e

**wikipedia.org**| 2011/5/27 0:47:49