I am doing a project for my physics class where I am attempting to calculate the amount of force and work required to go up a 10% grade hill in a variety of different gears and I am running into a lot of issues. I have already collected my data and have calculated gear ratios for each of my gears as well as velocity for my different gears going up the hill. What I am wondering is, how do you calculated the force and work needed to go up a hill in a certain gear? I understand that gravity and normal force are at play as well as frictional force but I am having trouble getting the force applied by the rider to the pedal and getting my head around everything. If you need more information I have it so please ask.