John loves Physics and wants to learn everything Physics. But lately, he's been confiding to his dad that his physics teacher frequently insults him when he asks questions or the teacher often asks him difficult questions that he can't answer. My friend is concerned because his son did not go to physics class for three straight days last week because of this issue. I tried to talk to John, told him to take this as a challenge, but I wasn't able to convince him. Perhaps you can help me help him.