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  Encyclopedia of Keywords > Science > Industry > Manufacturing > Measurement > Velocity   Michael Charnine

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    This Review contains major "Velocity"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. Velocity is the combination of speed and direction together.
  2. Velocity is a vector.
  3. Velocity is defined as the rate of change of displacement or the rate of displacement.
  4. Velocity is a vector quantity, whereas speed refers only to the magnitude of the velocity.
  5. Velocity is one of the factors which contribute to the carrying capacity of a drilling fluid.


  1. If voltage is taken to be force and current velocity, elastance corresponds to the elastic constant of a spring.
  2. Particles with different mass have different velocity distributions, but the average kinetic energy is the same because of the ideal gas law.
  3. If a is a constant then Phi+a is also a velocity potential for mathbf{u}.
  4. The normal component of velocity vanishes when = –2, and the tangential component vanishes when = 4.

Angular Velocity

  1. For the case where the angular momentum is parallel to the angular velocity, the moment of inertia is simply a scalar.
  2. The angular velocity of a point particle or rigid body describes the rate at which its orientation changes.
  3. Angular velocity is related to rotational speed, which is measured in units such as revolutions per minute.


  1. A rock of one Darcy permeability is one in which fluid centipoise viscosity will flow at a velocity of one centimeter.
  2. The viscosity can be found by adjusting the load until the rotation velocity is 200 rotations per minute.

Areal Velocity

  1. Areal velocity is the rate at which area is swept by the position vector of a point which moves along a curve.
  2. Kepler's second law of planetary motion is a statement of conservation of areal velocity of the orbiting planet with respect to the Sun.
  3. Figure 1. Areal velocity is the area (shown in yellow) swept per unit time by a particle moving along a curve (shown in blue).
  4. The areal velocity vector can be placed at the moving point B. As the particle moves along its path in space, it sweeps out a cone-shaped surface.
  5. Areal velocity From Biocrawler, the free encyclopedia.

Angular Momentum

  1. Angular momentum can also be calculated by multiplying the square of the displacement r, the mass of the particle and the angular velocity.
  2. Because angular momentum is constant in the absence of external torques, the angular velocity (rotational speed) of the skater has to increase.
  3. Angular momentum is conserved if and only if the areal velocity is a constant vector.

Velocity Vector

  1. Angular velocity is the vector physical quantity that represents the rotation of a spinning body.
  2. The direction of the angular velocity vector will be along the axis of rotation and In this case (counter-clockwise rotation) toward the viewer.
  3. Angular velocity is the vector physical quantity that represents the process of rotation (change of orientation) that occurs at an instant of time.

Two Dimensions

  1. In two dimensions the angular velocity is a single number which has no direction.
  2. The dimensions of angular velocity are T -1, since radians are dimensionless.
  3. In two dimensions, angular velocity is a scalar quantity.
  4. The product of the rotational inertia of a body and its angular velocity.


  1. Non-Newtonian fluids exhibit a more complicated relationship between shear stress and velocity gradient than simple linearity.
  2. The viscous stress tensor described above gives the force due to the fluid velocity only.
  3. Hence, through this method, the relation between the shear stress and the velocity gradient can be obtained.


  1. The scalar absolute value ( magnitude) of velocity is speed.
  2. In another example the Space Shuttle orbits the earth at a constant speed but is constantly changing its velocity because of the circular orbit.
  3. The escape velocity at a given height is √2 times the speed in a circular orbit at the same height, compare (14) in circular motion.


  1. In the case of pure circular motion, the angular velocity is equal to linear velocity divided by the radius.
  2. In the case of generalized motion, the linear velocity is replaced by its component perpendicular to r, viz.
  3. For a rigid body it supplements translational velocity of the center of mass to describe the full motion.
  4. Orbital Plane The plane containing the centre of mass of the earth and the velocity vector (direction of motion) of a satellite.
  5. For shorter motions, the maximum acceleration or maximum velocity may never be reached.


  1. The magnitude of the radial velocity is the dot product of the velocity vector and the unit vector in the direction of the displacement.
  2. The magnitude of the transverse velocity is that of the cross product of the unit vector in the direction of the displacement and the velocity vector.
  3. Vectors play an important role in physics: velocity and acceleration of a moving object and forces acting on a body are all described by vectors.

Vector Quantity

  1. Angular frequency is the magnitude of the vector quantity angular velocity.
  2. Equation (4) gives the magnitude of the angular velocity vector.
  3. The angular velocity in this case is generally thought of as a vector, or more precisely, a pseudovector.

Group Velocity

  1. The group velocity is often thought of as the velocity at which energy or information is conveyed along a wave.
  2. If ω is directly proportional to k, then the group velocity is exactly equal to the phase velocity.
  3. Each frequency component propagates at its own phase velocity, while the energy of the disturbance propagates at the group velocity.
  4. In particular, the energy travels at the group velocity rather than the phase velocity.

Linear Momentum

  1. Notice that twice the areal velocity times mass equals angular momentum, just as linear velocity times mass is linear momentum, i.e.
  2. Examples of vectors include displacement, velocity, electric field, momentum, force, and acceleration.
  3. The momentum of the ball is clearly not conserved since it's change in momentum is 2mv if it rebounds with the same velocity.
  4. Last check: 2007-10-07) The linear momentum of an objext of mass M, moving with a velocity of V is defined as the product of the mass and the velocity.

Angular Speed

  1. Angular acceleration is the rate of change of angular velocity over time.
  2. The magnitude of the angular velocity is the angular speed (or angular frequency) and is denoted by ω.
  3. The velocity of an object is simply its speed in a particular direction.
  4. The angular velocity of a particle in a 2-dimensional plane is the easiest to understand.
  5. Angular velocity is usually represented by the symbol omega ( -- or --). The angular speed is denoted by --.

Reference Point

  1. Areal velocity depends on a reference point: the origin of the coordinate system of the position vector, which is a function of time.
  2. This angular velocity is the "spin" angular velocity of the rigid body as opposed to the angular velocity of the reference point O' about the origin O.
  3. The angular velocity of the reference point about the origin of the lab frame will, however, depend on these choices of coordinate system.


  1. With changing velocity, accelerated objects exist in warped space (as do those that reside in a gravitational field).
  2. Remind students what the term escape velocity means: the velocity needed to escape a planet's gravitational pull.
  3. Where m is the mass of the object, M mass of the earth, G is the gravitational constant, R is the radius of the earth, and v is the escape velocity.

Average Velocity

  1. It is customary to introduce the concept of velocity by first defining average velocity as displacement divided by time.
  2. The average velocity of an object undergoing constant acceleration is , where u is the initial velocity and v is the final velocity.
  3. The average velocity increases rapidly in the first twenty yards.

Relative Velocity

  1. In Newtonian mechanics, the relative velocity is independent of the chosen inertial reference frame.
  2. The stability criterion for viscous potential flow is expressed by a critical value of the relative velocity.

Constant Velocity

  1. Explain. Draw a graph of a constant velocity line.
  2. A marble sinks through a jar of honey at constant velocity.
  3. Explain. We know the net force on a car moving at constant velocity is zero.

Per Second

  1. The SI unit of angular velocity is radians per second, although it may be measured in other units such as degrees per second, degrees per hour, etc.
  2. Q is the charge in coulombs, and v is the velocity of that charge in metres per second.
  3. On the surface of the Earth the escape velocity is about 11.2 kilometres per second.

Classical Mechanics

  1. In classical mechanics, momentum (traditionally written as p) is defined as the product of mass and velocity.
  2. Classical mechanics is enhanced by special relativity for objects moving with high velocity, approaching the speed of light.


  1. The term "acceleration" generally refers to the rate of change in instantaneous velocity.
  2. The instantaneous velocity field in the viscous liquid is assumed to be irrotational.


  1. Viscous forces in a fluid are a function of the rate at which the fluid velocity is changing over distance.
  2. For small amplitudes, sound pressure and particle velocity are linearly related and their ratio is the acoustic impedance.
  3. To accelerate an object is to change its velocity over a period of time.
  4. The escape velocity from the surface of a rotating body depends on direction in which the escaping body travels.
  5. Isaac Newton's analysis of escape velocity.


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  Originally created: June 24, 2008.
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