- the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force.
- an analogous property of a force: electric inertia.
- inert gas,
- inertia force,
- inertia selling,
- inertia time,
- inertia-reel seat belt,
Origin of inertia
Examples from the Web for inertial
Inertial mass is the amount of matter in an object, the measure of the resistance an object has when a force pushes it.The Equivalence Principle and Testing Einstein With Spaceships and Atoms|Matthew R. Francis|June 4, 2014|DAILY BEAST
"You are, of course, aware of the problems inherent in the development of inertial systems," Marks began.The Electronic Mind Reader|John Blaine
The delicate accelerometers and inertial guidance components did all the piloting until the second stage kicked us loose.The Trouble with Telstar|John Berryman
They are the inertial power – rather than the counterfist of reform.After the Rain|Sam Vaknin
- the tendency of a body to preserve its state of rest or uniform motion unless acted upon by an external force
- an analogous property of other physical quantities that resist changethermal inertia
1713, introduced as a term in physics 17c. by German astronomer and physician Johann Kepler (1571-1630), from Latin inertia "unskillfulness, idleness," from iners (genitive inertis) "unskilled, inactive;" see inert. Used in Modern Latin by Newton (1687). Sense of "apathy" first recorded 1822.
In physics, the tendency for objects at rest to remain at rest, and for objects in uniform motion to continue in motion in a straight line, unless acted on by an outside force. (See Newton's laws of motion.)