![]() Such reference frames are called inertial frames. This gives rise to a further, more precise reformulation: It is always possible to find a reference frame on which bodies on which no external forces act move with constant speed along straight paths. Strictly speaking, though, this law is only true in specific reference frames. In the geometrical language of special relativity, this can be reformulated as: bodies on which no external forces act move on straight line in spacetime. law of (inertia) Basic law of classical mechanics and special relativity: bodies on which no external forces act move with constant speed on straight paths. Depending on the framework used, there is classical mechanics, relativistic mechanics and quantum mechanics. mechanics Branch of physics dealing with the motions of objects and how they react to forces acting on them. One Newton is the force needed to impart on a body of mass one kilogram an acceleration of one metre per second-squared. ![]() In the international system of units ( SI) the unit of force, abbreviation N. NewtonĮnglish physicist of the 16th/17th century, see Newtonian gravity, below. ![]() Defined as a certain multiple of the oscillation period of electromagnetic radiation set free in a certain transition within the electron shell of atoms of the type Cesium-133. second In the International System of units: the basic unit of time. A one-sphere, for instance, is the same as a circle, a two-sphere is the spherical surface defined above, a three-sphere its three-dimensional analogue. And not only for the two-dimensional spherical surface described above, but also for its analogues in lower and higher dimensions. Sphere is regularly used as a synonym for spherical surface (instead of describing a solid, three-dimensional ball). Mathematically, a spherical surface can be described without recourse to three-dimensional space - when mathematicians talk of the geometry of such a surface, they (almost) always mean the "inner geometry": Those properties of the surface noticeable to two-dimensional beings, living and working in that surface, capable of measuring distances and angles in it. It is easily pictured as a surface embedded in three-dimensional space: a spherical surface is the set of all points at a certain fixed distance from a given point (the point being the centre of the sphere). sphere A spherical surface is a simple example for a curved surface. Ein Newton entspricht dabei der Kraft, die nötig ist, um einem Objekt mit einer Masse von einem Kilogramm eine Beschleunigung von einem Meter pro Sekunde-Quadrat zu erteilen. Definitioner Newton Englischer Physiker (1643-1727), siehe weiter unten Newtonsche Gravitation.ĭie Einheit der Kraft im internationalen Einheitensystem ( SI).
0 Comments
Leave a Reply. |