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==Key Stage 3==
===Meaning===
[[Deformation]] is to change the shape of an [[object]] by applying a pair of [[force]]s.
===About Deformation===
: [[Object]]s are '''deformed''' by the action of a pair of [[force]]s.
: 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.