When a force acts on an object, the object may change shape by bending, stretching or compressing - or a combination of all three shape changes. However, to change the shape of a stationary object there must be more than one force acting to do one of the following.
Bend an object's ends past each other, eg when an archer pulls an arrow back against a bow.
Pull an object's ends apart, eg when a rubber band is stretched.
Push an object's ends together, eg when an empty drinks can is squashed.
A change in shape is called deformation:
A rubber band undergoes elastic deformation when stretched a little. A metal drinks can undergoes plastic deformation when it is squashed.