Explanation: Bernard's experiment investigated the effect of the air pressure in the footballs. He decided how much air to put in each ball. The air pressure in the footballs did not depend on what happened in the experiment. So, the air pressure in the footballs was an independent variable in this experiment.
The air pressure of the football can stand on it's own, there isn't anything affecting it. instead, the air pressure is influencing the experiment. The dependant variable I'm this experiment would be the distance traveled.
