Inertia
/ɪˈnɜːʃə/
Definitions
2 meaningsThe tendency of an object to resist changes in its state of motion; the 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.
/ɪˈnɜːʃə/
Resistance to change in motion
The spacecraft's inertia kept it moving through space even after the engines shut off.
💡 Simply: Imagine you're trying to push a big box across the floor. If the box is heavy, it's hard to get it moving, and once it's moving, it's hard to stop. That's inertia! It's like the box's natural laziness.
👶 For kids: It's when things don't want to change. Like, if a toy car is just sitting there, it wants to keep sitting there unless you push it!
More Examples
The weight of the train gave it significant inertia, making it difficult to stop quickly.
Overcoming the inertia of the bureaucracy required a sustained effort.
How It's Used
"Newton's first law of motion describes inertia: an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a force."
"The company struggled to implement the new strategy due to organizational inertia."
A tendency to do nothing or to remain unchanged.
/ɪˈnɜːʃə/
Apathy or inactivity
Despite numerous warnings, the council faced political inertia on the issue of climate change.
💡 Simply: Sometimes things just stay stuck, even when they should change. Think of a really stubborn group of people who don't want to try new things. That's inertia, like a long, slow, 'no thanks'.
👶 For kids: Sometimes things just stay still and don't want to change. It's like a long yawn or a very slow turtle.
More Examples
The project stalled due to the inertia of the team.
The manager's inertia in making crucial decisions cost the company a significant amount of revenue.
How It's Used
"The government faced political inertia in trying to pass the new legislation."
"The company's marketing department suffered from inertia when they did not try new approaches to advertising."
Idioms & expressions
Inertial frame of reference
A frame of reference in which Newton's first law of motion (the law of inertia) holds.
"In an inertial frame of reference, an object at rest stays at rest unless acted upon by a force."
From Latin *inertia* meaning 'idleness, inactivity', derived from *iners* meaning 'inactive, unskilled'. The concept has roots in physics and philosophy.
The term's usage in physics can be traced back to the 17th century with the works of Isaac Newton and Galileo Galilei. Figurative uses relating to reluctance to change emerged later.
Memory tip
Think of a heavy object; it takes a lot of effort (force) to get it moving or stop it.
Word Origin
"inactive, unskilled"