Force

=== Normal ===
[[File:Incline.svg|right|thumb|''F''<sub>N</sub> represents the [[normal force]] exerted on the object.]]
{{main|Normal force}}
When objects are in contact, the force directly between them is called the normal force, the component of the total force in the system exerted normal to the interface between the objects.<ref name=Cutnell>{{Cite book |last1=Cutnell |first1=John D. |title=Physics |last2=Johnson |first2=Kenneth W. |date=2004 |publisher=Wiley |isbn=978-0-471-44895-2 |edition=6th|location=Hoboken, NJ}}</ref>{{rp|264}} The normal force is closely related to Newton's third law. The normal force, for example, is responsible for the structural integrity of tables and floors as well as being the force that responds whenever an external force pushes on a solid object. An example of the normal force in action is the impact force on an object crashing into an immobile surface.<ref name=FeynmanVol1 />{{rp|at=ch.12}}<ref name=Kleppner />
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