a cloth is a kind of object & a wood paint is a mean of preposition ->  a cloth and a plastic strip are kinds of object  a cloth and a plastic strip are kinds of object & there is a negatively-charged piece of cloth & there is a negatively-charged plastic strip & charge is a property of an object and includes ordered values of negatively-charged / neutral / positively-charged -> the whole of napkin and wood paint have the same free of yes free the piece of cloth and plastic strip have the same charge of negative charge  a cloth is a kind of object & a wood paint is a mean of preposition -> a cloth and a plastic strip are kinds of object a cloth and a plastic strip are kinds of object  the whole of napkin and wood paint have the same free of yes free & a cloth and a plastic strip are kinds of object & if two objects have the same electrical charge then those two objects will repel each other when they are close to each other -> the negatively-charged plastic strip and negatively-charged piece of cloth will repel each other