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Linear Momentum
In Newtonian mechanics, momentum (more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If is an object's mass and is its velocity (also a vector quantity), then the object's momentum is : \mathbf = m \mathbf. In the International System of Units (SI), the unit of measurement of momentum is the kilogram metre per second (kg⋅m/s), which is equivalent to the newton-second. Newton's second law of motion states that the rate of change of a body's momentum is equal to the net force acting on it. Momentum depends on the frame of reference, but in any inertial frame it is a ''conserved'' quantity, meaning that if a closed system is not affected by external forces, its total linear momentum does not change. Momentum is also conserved in special relativity (with a modified formula) and, in a modified form, in electrodynamics, quantum mechanics, quantum f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Billard
Établissements Billard was a French railway rolling stock construction company founded in 1920 and based in Tours. It specialised in light railbuses and metre gauge and narrow gauge rolling stock. The business ceased trading in 1956 and later became Socofer. Production Draisines * Draisines : These worked on different VFILs, and for the "Big Companies" which became the SNCF. Locomotives * T50 * T75D * T75P * T75G These were designed for the French Military Railway. They were used, among other things, to service the Maginot Line. * SNCF Class Y 7100 Railbuses Railbuses for numerous French VFIPs (secondary railways) * Type A 80D, * Type A 135D, * Type A 150D, * Type A 210D, * Networks of the Compagnie des chemins de fer départementaux, including: ** Corse, ** Vivarais, ** Indre et Loire, ** Seine-et-Marne * Tramways d'Ille-et-Vilaine Company * Overseas networks: ** Madagascar ** Réunion * French West Africa: ** Dakar Niger ** Dahomey * Ethiopia: ** Chemin de fer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
