When it comes to the math for phyics I start out by asking the class, "Who in here can not do math?" Completely aware of course they had to pass the math portion of an entrance exam to get into the school. When the hands shoot up, I just prove them wrong. "2 + 2=? 2 X 2=? A + B= C. If A=2 and B=2 C=?"  As they answer the questions with ease, I will say, "So you can do math after all." Then they usually will say, "Yeah, but thats easy stuff. Thats not physics." I just smile… >>>