## Inertia

**Inertia** is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion. The principle of inertia is one of the fundamental principles of classical physics which are used to describe the motion of matter and how it is affected by applied forces. Inertia comes from the Latin word, *iners*, meaning idle, or lazy. Isaac Newton defined inertia as his first law in his *PhilosophiÃ¦ Naturalis Principia Mathematica*, which states:

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### Some articles on inertia:

... In a stable state, the largest moments of

**inertia**axis is aligned with the spin axis, with the smaller two moment of

**inertia**axes lying in the plane of the equator ... body to realign the largest moment of

**inertia**axis with the spin axis ...

**Inertia**

... over the information provided by calculating the area moments of

**inertia**and polar moments of

**inertia**...

**Inertia**

... Another form of

**inertia**is rotational

**inertia**(â†’ moment of

**inertia**), which refers to the fact that a rotating rigid body maintains its state of uniform rotational motion ... Rotational

**inertia**depends on the object remaining structurally intact as a rigid body, and also has practical consequences For example, a gyroscope uses the ...

... The Morison equation is the sum of two force components an

**inertia**force in phase with the local flow acceleration and a drag force proportional to the (signed) square of the instantaneous flow ... The

**inertia**force is of the functional form as found in potential flow theory, while the drag force has the form as found for a body placed in a steady flow ... Johnson and Schaaf these two force components,

**inertia**and drag, are simply added to describe the force in an oscillatory flow ...

**Inertia**

... The following is a list of area moments of

**inertia**... The area moment of

**inertia**or second moment of area has a unit of dimension length4, and should not be confused with the mass moment of

**inertia**... If the piece is thin, however, the mass moment of

**inertia**equals the areal density times the area moment of

**inertia**...

### More definitions of "inertia":

- (
*noun*): A disposition to remain inactive or inert.

Example:*"He had to overcome his inertia and get back to work"*

Synonyms: inactiveness, inactivity

### Famous quotes containing the word inertia:

“What is wrong with priests and popes is that instead of being apostles and saints, they are nothing but empirics who say “I know” instead of “I am learning,” and pray for credulity and *inertia* as wise men pray for scepticism and activity.”

—George Bernard Shaw (1856–1950)