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'''Inertia''' is a property of matter that causes it to resist changes in [[velocity]].
'''Inertia''' is a property of matter that causes it to resist changes in [[velocity]]; or, in other words, the resistance against being set in [[motion]], and resistance to being stopped when in motion.<ref name="KelvinTides">{{cite web |title=August 25, 1882 |author=W. Thomson (Lord Kelvin) |publisher= The British Association, The Glasgow Science Lectures Association |year=August 25, 1882 |Chapter= Appendix A |url=http://zapatopi.net/kelvin/papers/the_tides.html |aaccessdate=June 13, 2015}}</ref>
[[Newton]] [[scientific discovery|discovered]] that bodies which have equal [[heaviness]] have equal ''inertia'', i.e. that if the property of inertia is possed to an equal degree by two different [[substance]]s, the have equal heaviness. One of his [[proof]]s was founded on the celebrated guinea and feather [[experiment]], showing that the guinea and feather fall at the same rate when the resistance of the [[air]] is removed. Another was founded upon making pendulums of different substances—[[lead]], [[iron]], and [[wood]] to vibrate, and [[scientific observation|observing]] their times of [[vibration]].<ref name="KelvinTides"/>
==References==
<references/>
[[category:physics]]
[[category:physics]]