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: [[Plastic (Material)|Plastic]]
: [[Metal]]
: [[Brick]]
: [[Rock]]
===About Deformation===
: [[Object]]s are '''deformed''' by the action of a pair of [[force]]s.
: Two [[force]]s must be acting in different directions on 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.