Answer is: ductility and malleability.
Gum changes is deformed (it changes shape). This is physical shape.
The same substance is present before and after the psysical change, just with different form (shape) or state of matter.
Ductility is the property of the metal to be deformed without losing toughness.
Mallebility is the property or ability of the metal to be hammered or pressed into shape without breaking or cracking.