GRADE 9 SCIENCE PROJECT!!!!!!!!!!!!!!!!!!!!!!!…

im in grade 9, and for my summative i need to do an experiment. it needs an independent and dependant variable. one example he told us was, if someone runs a course with a pair of shoes, then they run it again with softer shoes, then run it again with even softer shoes and you see the difference and how the softness of the shoes effects the way you run the race. i need something that i can do in class, please help me !