a pencil is a kind of object & sharpening a pencil changes the shape of the pencil ->  sharpening a pencil changes the shape of an object  paper is a kind of object & tearing paper changes the shape of the paper ->  tearing paper changes the shape of an object  sharpening a pencil changes the shape of an object & tearing paper changes the shape of an object ->  sharpening a pencil and tearing paper both change the shape of the object  sharpening a pencil and tearing paper both change the shape of the object & shape is a property of the appearance of an object ->  sharpening a pencil and tearing paper both change the appearance of the object  sharpening a pencil and tearing paper both change the appearance of the object & appearance is a kind of physical property ->  sharpening a pencil and tearing paper both change the physical property of the object  sharpening a pencil and tearing paper both change the physical property of the object & if something undergoes a physical change then the physical properties of that something will change -> pencil and paper underwent a physical change