momentum - définition. Qu'est-ce que momentum
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Qu'est-ce (qui) est momentum - définition

CONSERVED PHYSICAL QUANTITY RELATED TO THE MOTION OF A BODY
Linear momentum; Conservation of momentum; Linear Momentum; Kinetic momentum; Generalized Momentum; Conservation of impulse; Relativistic Momentum; Law of conservation of linear momentum; Force summation; Conservation of Momentum; Relativistic momentum; Momentum (physics); Conservation of linear momentum; Law of conservation of momentum; Momentum conservation; Potential momentum; Linear momenta; P=mv; Momentum vector; Classical three-dimensional momentum; Orders of magnitude (momentum); System of momentum
  • A pool break-off shot
  • Elastic collision of equal masses
  • Elastic collision of unequal masses
  • Two-dimensional elastic collision. There is no motion perpendicular to the image, so only two components are needed to represent the velocities and momenta. The two blue vectors represent velocities after the collision and add vectorially to get the initial (red) velocity.
  • Motion of a material body
  • a perfectly inelastic collision between equal masses

momentum         
n.
[L.]
1.
Impetus, moment.
2.
Constituent, essential element, moment.
momentum         
[m?'m?nt?m]
¦ noun (plural momenta -t?)
1. the impetus gained by a moving object.
the driving force gained by the development of a process: the investigation gathered momentum.
2. Physics the quantity of motion of a moving body, equal to the product of its mass and velocity.
Origin
C17: from L., from movimentum, from movere 'to move'.
momentum         
1.
If a process or movement gains momentum, it keeps developing or happening more quickly and keeps becoming less likely to stop.
This campaign is really gaining momentum...
= impetus
N-UNCOUNT
2.
In physics, momentum is the mass of a moving object multiplied by its speed in a particular direction. (TECHNICAL)
N-UNCOUNT

Wikipédia

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 m is an object's mass and v is its velocity (also a vector quantity), then the object's momentum p (from Latin pellere "push, drive") is : p = m v . {\displaystyle \mathbf {p} =m\mathbf {v} .}

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 field theory, and general relativity. It is an expression of one of the fundamental symmetries of space and time: translational symmetry.

Advanced formulations of classical mechanics, Lagrangian and Hamiltonian mechanics, allow one to choose coordinate systems that incorporate symmetries and constraints. In these systems the conserved quantity is generalized momentum, and in general this is different from the kinetic momentum defined above. The concept of generalized momentum is carried over into quantum mechanics, where it becomes an operator on a wave function. The momentum and position operators are related by the Heisenberg uncertainty principle.

In continuous systems such as electromagnetic fields, fluid dynamics and deformable bodies, a momentum density can be defined, and a continuum version of the conservation of momentum leads to equations such as the Navier–Stokes equations for fluids or the Cauchy momentum equation for deformable solids or fluids.

Exemples du corpus de texte pour momentum
1. Momentum is either upward momentum or downward momentum.
2. Hillary Clinton: "I think we have tremendous momentum." Mike Huckabee, yesterday: "We‘ve had an extraordinary momentum . . . [blah–blah–blah] momentum . . . [blah–blah] momentum." Well, gosh, Ma.
3. Markets have momentum, similar to moving objects’ momentum.
4. The simplest type of momentum is the rate of change momentum indicator.
5. What it insures is momentum, and for now, momentum is the name of the game.