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What is the difference between momentum and inertia?
I read at http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2009/12/091211_witn_china_page.shtml that “China’s latest economic data suggests the country’s recovery is gaining momentum.” I need to understand the difference between inertia and momentum. Thanks.
Jaime Montoya
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Momentum is simply mass times velocity. The more mass something has, or the faster it moves, the greater the momentum. China’s recovery is gaining momentum likely because whatever units it’s measured by are occurring faster and faster.
Inertia is simply the tendency of something to stay at rest or in motion with no outward force acting upon it. If China’s recovery possessed inertia, then the removal of outside influences would result in a recovery that no longer gained momentum, but simply proceeded on at it’s last momentum value, neither increasing nor decreasing.
Extreme Data Recovery – Disklabs Data Recovery on the BBC News