My physics teacher was really good with this stuff. He put things into context. This example is not true, however, this example is true enough to teach you xyz. He suggested that part of continuing on to higher forms of physics study meant that a lot of these older concepts had to be beaten out of you, and his preference was largely not to rely/solidify them as concepts so it wouldnt take as much energy to remove them later. We were encouraged to find ways to break these examples too, if we could, which was rare, and on some occasions he would stay back to demonstrate how they were false after class.