This lab is a favorite every year as students try to hit a bull’s-eye with a projectile. I normally provide a candy reward for the team with the lowest percent error. (It’s amazing what a piece of candy will make students do!) Projectile motion can be one of the most difficult concepts all year long as students are forced, many of them for the first time ever, to look at something in two different dimensions. I always spend a decent amount of time explaining to them that the constant speed motion they learned about in the very beginning of the year (when they were “baby physics students”) corresponds to horizontal motion and accelerated motion corresponds to vertical motion. If you can spend time making sure that students know this, you set them up to be very successful with projectile motion.