Moment of force

Moment of Force (Torque or Bending Moment). Moment of force is force times moment arm (lever arm). Its SI unit is N-m. 

Boltzmann s constant T moment of force, thermodynamic temperature (in... 

Moment of force or bending moment torque moment of a couple M(S) Dyne centimeter Kilogram force meter Foot poundal Pound-force foot... 

The second moment of force about the same axis is the product of the force and the square of the distance between its line of action and the axis. This is the moment of inertia. The most direct example of its use is possibly connected with the motion of a rotating body, for which the rotational acceleration caused by an applied torque is calculated by dividing the torque by the moment of inertia of the body. The concept of a second moment has been extended to other less readily... 

In a rotational viscometer the solution is filled in the annulus between two concentric cylinders of which either the external (Couette-Hatschek type) or the internal (Searle type) cylinder rotates and the other, which is connected to a torsion-measuring device, is kept in position. Let R, and Ro be the radii of the inner and outer cylinders, h the height of the cylinder which is immersed in the solution or its equivalent height if end effects are present, a> the angular velocity of the rotating cylinder, and T the torque (or moment of force) required to keep the velocity constant against the viscous resistance of the solution. It can be shown that the shearing stress (see, for example, Reiner, 1960) ... 

If the settling direction is not vertical, this means that a falling particle is subject to the action of a transverse force, which leads to its horizontal displacement. An additional complication is that the center of hydrodynamic reaction (including the buoyancy force) does not coincide with the particle center of mass. In this case, in addition to the translational motion, the particle is subject to rotation under the action of the arising moment of forces (e.g., the somersault of a bullet with displaced center of mass). For axisymmetric particles, this rotation stops when the system the mass center + the reaction center becomes stable, that is, the mass center is ahead of the reaction center. In this case, the settling trajectory becomes stable and rectilinear. 

Static analysis requires consideration of forces and moments of force acting on the body at rest (static equilibrium). A magnitude of the moment of force at the point of rotation is equal to the product of force and the perpendicular distance from the force action line to that point. The moment (M) equals force (F) times moment arm (d), with unit of measurement (N-m). The static analysis ignores the effects of accelerations, momentum, and friction and is adequate only for analysis of static postures. 

Second law Given O is a fixed point on the inertial reference frame, the rate of change of the angular momentum of the body about O is equal to net moment of forces acting on the body about O. 

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