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Pendulum
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=== Education === Pendulums are widely used in [[science education]] as an example of a [[harmonic oscillator]], to teach [[dynamics (mechanics)|dynamics]] and [[oscillatory motion]]. One use is to demonstrate the law of [[conservation of energy]].<ref name=Hart>{{cite web|last1=Hart|first1=Matthew|title=Physics Risks Death by Wrecking Ball for Science|url=http://nerdist.com/physics-risks-death-by-wrecking-ball-for-science/|website=Nerdist|access-date=14 March 2017|language=en|date=2 February 2016|archive-date=15 March 2017|archive-url=https://web.archive.org/web/20170315085935/http://nerdist.com/physics-risks-death-by-wrecking-ball-for-science/|url-status=dead}}</ref><ref>{{cite book|last1=Sorenson|first1=Roy|editor1-last=Booth|editor1-first=Anthony Robert|editor2-last=Rowbottom|editor2-first=Darrell P.|title=Intuitions|date=2014|publisher=Oxford Univ Pr|isbn=9780199609192|page=139|chapter-url=https://books.google.com/books?id=ttX1AwAAQBAJ&q=bowling+ball+pendulum+experiment&pg=PA139|access-date=15 March 2017|chapter=Novice Thought Experiments}}</ref> A heavy object such as a [[bowling ball]]<ref>{{cite web|title=Bowling Ball Pendulum|url=http://wonders.physics.wisc.edu/bowling-ball-pendulum.htm|website=The Wonders of Physics|publisher=University of Wisconsin–Madison|access-date=14 March 2017|language=en}}</ref> or [[wrecking ball]]<ref name=Hart/> is attached to a string. The weight is then moved to within a few inches of a volunteer's face, then released and allowed to swing and come back. In most instances, the weight reverses direction and then returns to (almost) the same position as the original release location — ''i.e.'' a small distance from the volunteer's face — thus leaving the volunteer unharmed. On occasion the volunteer is injured if either the volunteer does not stand still<ref>{{cite web|last1=weknowmemes|title=Physics Ball Test Gone Wrong|url=https://www.youtube.com/watch?v=teqsNtYbJAY| archive-url=https://ghostarchive.org/varchive/youtube/20211110/teqsNtYbJAY| archive-date=2021-11-10 | url-status=live|website=YouTube|access-date=14 March 2017|date=8 August 2014}}{{cbignore}}</ref> or the pendulum is initially released with a push (so that when it returns it surpasses the release position).
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