# Momentum vs. Inertia — What's the Difference?

## Compare with Definitions

#### Momentum

In Newtonian mechanics, linear momentum, translational momentum, or simply momentum (pl. momenta) is the product of the mass and velocity of an object.
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#### Inertia

Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion.
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#### Momentum

Symbol p(Physics) A quantity used to measure the motion of a body, equal to the product of the body's mass and its velocity. Also called linear momentum.
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#### Inertia

A tendency to do nothing or to remain unchanged
The bureaucratic inertia of the various tiers of government
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#### Momentum

The force or energy exhibited by a moving body
The ball did not have enough momentum to reach the goalposts.
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#### Inertia

A property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force
The power required to overcome friction and the inertia of the moving parts
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#### Momentum

The driving force or advancing strength of a development or course of events
The effort to reform public education has been gaining momentum.
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#### Inertia

(Physics) The tendency of a body at rest to remain at rest or of a body in straight line motion to stay in motion in a straight line unless acted on by an outside force; the resistance of a body to changes in momentum.
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#### Momentum

(Philosophy) An essential or constituent element; a moment.
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#### Inertia

Resistance or disinclination to motion, action, or change
An entrenched bureaucracy's inertia.
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#### Momentum

(physics) Of a body in motion: the tendency of a body to maintain its inertial motion; the product of its mass and velocity, or the vector sum of the products of its masses and velocities.
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#### Inertia

The property of a body that resists any change to its uniform motion; equivalent to its mass.
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#### Momentum

The impetus, either of a body in motion, or of an idea or course of events; a moment.
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#### Inertia

(figuratively) In a person, unwillingness to take action.
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#### Momentum

The quantity of motion in a moving body, being always proportioned to the quantity of matter multiplied by the velocity; impetus.
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#### Inertia

(medicine) Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased.
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#### Momentum

Essential element, or constituent element.
I shall state the several momenta of the distinction in separate propositions.
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#### Inertia

That property of matter by which it tends when at rest to remain so, and when in motion to continue in motion, and in the same straight line or direction, unless acted on by some external force; - sometimes called vis inertiæ. The inertia of a body is proportional to its mass.
Aug 05, 2021

#### Momentum

A property of an activity or course of events, viewed as analogous to forward motion or to physical momentum (def. 1), such that the activity is believed to be able to continue moving forward without further application of force or effort; - often used to describe an increase in the acquisition of public support for a purpose; as, as, the petition drive gained momentum when it was mentioned in the newspapers.
Aug 05, 2021

#### Inertia

Inertness; indisposition to motion, exertion, or action; lack of energy; sluggishness.
Men . . . have immense irresolution and inertia.
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#### Momentum

An impelling force or strength;
The car's momentum carried it off the road
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#### Inertia

Lack of activity; sluggishness; - said especially of the uterus, when, in labor, its contractions have nearly or wholly ceased.
Aug 05, 2021

#### Momentum

The product of a body's mass and its velocity;
The momentum of the particles was deduced from meteoritic velocities
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#### Inertia

A disposition to remain inactive or inert;
He had to overcome his inertia and get back to work
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#### Inertia

(physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force
Aug 05, 2021