Editing Projectile (section)

{{Short description|Object propelled through the air}}
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[[File:155fire.jpg|thumb| A projectile being fired from an [[artillery]] piece]]
A '''projectile''' is an object that is propelled by the application of an external [[force]] and then moves freely under the influence of [[gravity]] and [[air resistance]].<ref>{{cite book|last1=Pius|first1=Okeke|last2=Maduka|first2=Anyakoha|title=Senior Secondary School Physics|publisher=Macmillan,Lagos, Nigeria|year=2001}}</ref><ref>{{cite web|url=http://www.merriam-webster.com/dictionary/projectile|title=projectile |website=merriam-webster.com |access-date=13 April 2017}}</ref> Although any objects in [[motion (physics)|motion]] through space are projectiles, they are commonly found in [[warfare]] and [[sport]]s (for example, a thrown [[Baseball (ball)|baseball]], kicked [[ball (association football)|football]], fired [[bullet]], shot [[arrow]], stone released from [[catapult]]).<ref>{{cite web |title=projectile |website=The Free Dictionary |url=http://www.thefreedictionary.com/projectile |access-date=2010-05-19}}</ref><ref>{{cite web |title=projectile |website=Dictionary.com |url=http://dictionary.reference.com/browse/projectile |access-date=2010-05-19}}</ref>

In [[ballistics]], mathematical [[equations of motion]] are used to analyze projectile [[trajectory|trajectories]] through launch, [[flight]], and [[terminal ballistics|impact]].