Vridningskraft

Vridningskraft, also known as torque or moment of force, is a measure of the twisting or rotational effect a force has on an object. It is the rotational analogue of linear force. Vridningskraft is created when a force is applied at a distance from an axis of rotation. The magnitude of vridningskraft depends on two factors: the magnitude of the applied force and the perpendicular distance from the axis of rotation to the point where the force is applied. This distance is often referred to as the lever arm or moment arm.

Mathematically, vridningskraft is calculated as the product of the force and the lever arm. If the force is applied at an angle, only the component of the force perpendicular to the lever arm contributes to the vridningskraft. The standard unit for vridningskraft in the International System of Units (SI) is the newton-meter (Nm). In some contexts, other units like foot-pound (ft-lb) may be used.

Vridningskraft is fundamental to understanding rotational motion. It is what causes objects to spin, rotate, or change their rotational speed. Examples include turning a doorknob, using a wrench to tighten a bolt, or the action of an engine's crankshaft. When an object is in rotational equilibrium, the net vridningskraft acting on it is zero.