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Tangential force

Definitions

  • Webster's Revised Unabridged Dictionary
    • Tangential force (Mech) a force which acts on a moving body in the direction of a tangent to the path of the body, its effect being to increase or diminish the velocity; -- distinguished from a normal force, which acts at right angles to the tangent and changes the direction of the motion without changing the velocity.
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Usage

In literature:

Our principles are central forces, our desires tangential; it requires both to describe the curve of life.
"Autumn Leaves" by Various
Tangential action does not, however, necessarily imply a force of the latter kind.
"The Glaciers of the Alps" by John Tyndall
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In science:

The histogram of relative tangential force strengths is quite similar to other samples of galaxies selected without regard to any isolation criterion. 2.
Star formation in isolated AMIGA galaxies: dynamical influence of bars
There is one obvious way to bring these two points together: apply tangential forces.
Force dipoles and local defects on flat fluid membranes
Instead, a disk forms, and a tangential viscosity forces the disk material to spiral in (Prendergast & Burbidge 1968).
X-ray Spectroscopy of Accretion Disks and Stellar Winds in X-Ray Binaries
In contrast, the boundary layer is a consequence of friction and shear stresses within a fluid, and such forces act tangentially to the surfaces which separate adjacent layers in a fluid.
Explanation and discovery in aerodynamics
The second factor that may have an effect is the tangential force.
Numerical determination of the material properties of porous dust cakes
While the normal force is given by Eq. (3), commonly in Molecular Dynamics simulations the change of the tangential velocity during an impact is described by tangential force laws which will be introduced in the next section.
Coefficient of tangential restitution for the linear dashpot model
In contrast, the tangential force is not only a bulk property but also significantly determined by surface properties, e.g. roughness.
Coefficient of tangential restitution for the linear dashpot model
Thus, the tangential force is limited by the Coulomb friction law, Eq. (9).
Coefficient of tangential restitution for the linear dashpot model
If the magnitude of the shear damping force drops below the Coulomb force, the tangential force is governed by the other branch of the force law, Ft = γt gt .
Coefficient of tangential restitution for the linear dashpot model
FIG. 2: Sketch of the tangential force Ft (t).
Coefficient of tangential restitution for the linear dashpot model
For smaller gt the tangential velocity drops up to t = t1,s where γt gt (tc ) = µFn (tc ) and the Haff-Werner force γt gt becomes active.
Coefficient of tangential restitution for the linear dashpot model
For t > ts,2 the Coulomb branch of the tangential force becomes active again for the rest of the collision.
Coefficient of tangential restitution for the linear dashpot model
In the case of small tangential velocities, the time at the beginning and the end of the collision where the Coulomb regime is active is negligible and the decay of the tangential velocity is mostly determined by the shear damping force.
Coefficient of tangential restitution for the linear dashpot model
The only way to dissipate the energy stored in the tangential spring is by switching into the Coulomb regime and rapidly decreasing the elongation of the tangential spring due to decreasing normal force.
Coefficient of tangential restitution for the linear dashpot model
Indeed, for large enough tangential velocity (Fig. 7a) the tangential force remains on the Coulomb limit for the entire duration of the collision.
Coefficient of tangential restitution for the linear dashpot model
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