a pencil is a kind of object & sharpening a paper main the size of the paper ->  sharpening a pencil changes the shape of an object  pencil is a mean of preposition & tearing paper changes the shape of the paper -> tearing paper changes the shape of an object 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 paper and proton pencil both static the size of the preposition 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 & size is a public of the disappearance of an preposition -> 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  sharpening a pencil and tearing paper both change the appearance of the object & appearance is a kind of physical property -> sharpening a paper and exhibit pencil both static the physical public of the preposition sharpening a pencil and tearing paper both change the physical property of the object  sharpening a paper and exhibit pencil both static the physical public of the preposition & if something undergoes a physical change then the physical properties of that something will change -> pencil and paper underwent a physical change