In physics, dynamics is the branch of classical mechanics that is concerned with the effects of forces on the motion of objects. The latter distinguishes it from statics. A black hole concept drawing by NASA. Physics (from the Greek, φυσικός (physikos), natural, and φύσις (physis), nature) is the science of the natural world dealing with the fundamental constituents of the universe, the forces they exert on one another, and the results produced by these forces. ... In physics, classical mechanics or Newtonian mechanics is one of the two major sub-fields of study in the science of mechanics, which is concerned with the set of physical laws governing and mathematically describing the motions of bodies and aggregates of bodies. ... In physics, a net force acting on a body causes that body to accelerate; that is, to change its velocity. ... In physics, motion means a change in the position of a body with respect to time, as measured by a particular observer in a particular frame of reference. ... Statics is the branch of physics that is concerned with physical systems that are in static equilibrium, that is, in a state where the relative positions of subsystems do not vary over time, or where components and structures are at rest under the action of external forces of equilibrium. ...

In economics, dynamics has substantially the same meaning as in physics. However, this kind of economics is less developed than is static economics, at least when it comes to mathematical economics. Change over time is often treated as simply a version of statics. U.S. Economic Calendar Economics at the Open Directory Project Economics textbooks on Wikibooks The Economists Economics A-Z Daily analysis of economics in the news (UK focus) Institutions and organizations Bureau of Labor Statistics - from the American Labor Department Center for Economic and Policy Research (USA) National Bureau... Statics is the branch of physics that is concerned with physical systems that are in static equilibrium, that is, in a state where the relative positions of subsystems do not vary over time, or where components and structures are at rest under the action of external forces of equilibrium. ...

Branches

• rigid body dynamics
  • kinematics
  • kinetics
• fluid dynamics
  • hydrodynamics
  • gas dynamics
    • aerodynamics

Rigid body dynamics differs from particle dynamics in that the body takes up space and can rotate, which introduces other considerations. ... In physics, kinematics is the branch of mechanics concerned with the motions of objects without being concerned with the forces that cause the motion. ... In physics, dynamics is the branch of mechanics that is concerned with the effects of forces on the motion of objects. ... Fluid dynamics is the subdiscipline of fluid mechanics that studies fluids (liquids and gases) in motion. ... Hydrodynamics is fluid dynamics applied to liquids, such as water, alcohol, oil, and blood. ... Aerodynamics is a branch of fluid dynamics concerned with the study of gas flows, first analysed by George Cayley in the 1800s. ...

Elementary principles

• Variational principles and Lagrange's equations
• Two-body central force problem
• Rigid body (in kinematics)
• Small oscillations
• Hamilton's equations
• Canonical transformations
• Hamilton-Jacobi Theory