Force

In physics, a force is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described by intuitive concepts such as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.

The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object

Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque, which produces changes in rotational speed of an object. In an extended body, each part usually applies forces on the adjacent parts; the distribution of such forces through the body is the so-called mechanical stress. Pressure is a simple type of stress. Stress usually causes deformation of solid materials, or flow in fluids.

Elemental

An elemental is a mythic being described in occult and alchemical works from around the time of the European Renaissance and particularly elaborated in the 16th century works of Paracelsus. There are four elemental categories: gnomes, undines, sylphs, and salamanders. These correspond to the Classical elements of antiquity: earth, water, air and fire. Aether (quintessence) was not assigned an elemental. Terms employed for beings associated with alchemical elements vary by source and gloss.

History

The Paracelsian concept of elementals draws from several much older traditions in mythology and religion. Common threads can be found in folklore, animism, and anthropomorphism. Examples of creatures such as the Pygmy were taken from Greek mythology.

The elements of earth, water, air, and fire, were classed as the fundamental building blocks of nature. This system prevailed in the Classical world and was highly influential in medieval natural philosophy. Although Paracelsus uses these foundations and the popular preexisting names of elemental creatures, he is doing so to present new ideas which expand on his own philosophical system. The homunculus is another example of a Paracelsian idea with roots in earlier alchemical, scientific, and folklore traditions.

Shane

Shane may refer to:

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