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Simple terms: The 'reason' that to why you have to use some sort of effort to move or stop something like an object.

The law/principle of inertia states that a body at rest will remain at rest and a body in motion will continue moving with a constant velocity unless acted upon by an external non zero force.

Don't confuse this with momentum
Due to inertia, a moving body in space (ie a vacuum) will not stop or deviate unless another non zero force acts on it (eg gravity)
by White Razor March 25, 2007
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May 14 Word of the Day
Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy
Person A: Man, that nutcase Martin Bryant guy shot 35 people in Tasmania!

Person B: No, he wasn't a nutcase, that was just a psyop so the government could have an excuse to ban guns.
by Mystikan April 11, 2006
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"Man, Jessica had so much inertia the other day, she couldn't even get off the couch!"
by smoking-glove December 20, 2012
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Tendency for a person to resist a change in movement; Force needed to generate the momentum to cause movement
"I'm hungry, but have no inertia to get up and go eat"
by Supersuperdude August 31, 2011
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Boostbuddy line of performance and making your slow car fast
I bought my turbo from Inertia and it's boosts like crazy!!!
by yourfriendlyasshole May 17, 2006
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