1. The problem statement, all variables and given/known data My science fair project (high school sophomore) is about calculating the amount of force that is sustained from a fall off of a horse at different heights at different gaits (speeds). I would then compare the force sustained in the fall and compare it to what certified helmets are qualified to protect against and see if they offer enough protection to the skull. My old science teacher recommended that I research vectors, and that was how I would be able to calculate the force. However, everything about vectors that I find is very far over my head. I was wondering if anyone here could either show me a link or explain to me in a dumb ed-down way what exactly vectors are, how to calculate the force from them, and what data I need to gather (if I need any more) in order to be able to calculate the force. My current science experience was last year's (honors) combination of Earth science and very basic physics and the beginning of this year's honors chemistry course. 2. Relevant equations I'm looking to learn how to calculate vector forces, so whatever equation(s) are used for that I suppose? 3. The attempt at a solution I've asked my science teacher from last year, and all he told me was to research vectors. Everything I found was way over my head so I'd like to know if there is a certain website or video where it is simplified to an easier to understand level.