The Gemara advises one to instruct his household gently ‘so that they accept from him’. The Rosh cites the Gemara (Gittin 6b) that a person should never instill excessive fear in his home. This reason would indeed seem a sufficient basis for our Gemara as well; why does the Gemara provide the reason of ‘acceptance’ instead?
We learn that a pan with ashes is not considered Muktzah (for ordinary people) due to some granules of incense that are present; thus these granules determine the status of the pan. Further on the Gemara teaches that wood chips don’t render the pan Muktzah since they aren’t valuable enough. Why do we consider granules more valuable than wood chips?