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→About Deformation
===About Deformation===
: [[Object]]s are '''deformed''' by the action of a pair of [[forceEquilibrium Forces]]s.: Two These [[forceEquilibrium Forces|equilibrium forces]]s must be are equal in [[magnitude]] but opposite in direction acting in at different directions on ends of an [[object]] to '''deform''' it. If there is only one [[force]] then the [[object]] will not '''deform''' it will just [[accelerate]].
: Some [[object]]s '''deform''' [[Plastic (Property)|plastically]] which means they stay in their new shape after the [[force]]s are gone.
: Some [[object]]s '''deform''' [[Elastic|elastically]] which means they will return to their original shape when the [[force]]s are gone.