momentum

[moh-men-tuhm]

noun

plural

momenta, momentums 

1. force or speed of movement; impetus, as of a physical object or course of events.

   The car gained momentum going downhill. Her career lost momentum after two unsuccessful films.

2. Also called linear momentum. Mechanics.,  a quantity expressing the motion of a body or system, equal to the product of the mass of a body and its velocity, and for a system equal to the vector sum of the products of mass and velocity of each particle in the system.

3. Philosophy.,  moment.

momentum

/ məʊˈmɛntəm /

noun

1. p. physics the product of a body's mass and its velocity See also angular momentum

2. the impetus of a body resulting from its motion

3. driving power or strength

momentum

plural

momenta 

1. A vector quantity that expresses the relation of the velocity of a body, wave, field, or other physical system, to its energy. The direction of the momentum of a single object indicates the direction of its motion. Momentum is a conserved quantity (it remains constant unless acted upon by an outside force), and is related by Noether's theorem to translational invariance. In classical mechanics, momentum is defined as mass times velocity. The theory of Special Relativity uses the concept of relativistic mass. The momentum of photons, which are massless, is equal to their energy divided by the speed of light. In quantum mechanics, momentum more generally refers to a mathematical operator applied to the wave equation describing a physical system and corresponding to an observable; solutions to the equation using this operator provide the vector quantity traditionally called momentum. In all of these applications, momentum is sometimes called linear momentum.

2. See also angular momentum impulse

momentum

1. In physics, the property or tendency of a moving object to continue moving. For an object moving in a line, the momentum is the mass of the object multiplied by its velocity (linear momentum); thus, a slowly moving, very massive body and a rapidly moving, light body can have the same momentum. (See Newton's laws of motion.)

Figuratively, momentum can refer to the tendency of a person or group to repeat recent success: “The Bears definitely have momentum after scoring those last two touchdowns.”

Word History and Origins

Origin of momentum¹

First recorded in 1690–1700; from Latin mōmentum; moment

Word History and Origins

Origin of momentum¹

C17: from Latin: movement; see _moment

Example Sentences

And England are picking up experience, options and momentum as they go.

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Traders aim to maintain momentum in November amid uncertainty regarding the Federal Reserve’s upcoming interest rate decision.

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With practice, I learned to use the front-heavy blade efficiently—using gravity, force and momentum to slice, dice and chop with less effort.

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England seemed to recapture the momentum just in time.

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Hutchinson received the ball facing the goal with time and space to carry it forwards with momentum.

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Related Words

• energy 
• power 
• strength