Everybody loves the unforgettable, visceral thrill of a rocket launch. Whether it's the Saturn V with 7.6 million pounds of thrust or a tiny model launched from your backyard, projectile motion can be studied and understood by students of all ages. In fact, many teachers conduct projectile motion demonstrations with water-powered or solid-fuel model rockets. These demos are exciting, but they are not examples of true projectiles! Instead of one initial launch force, they have a timed "burn" while the fuel is spent. With a true projectile, after the initial force, the only thing affecting the flight is gravity. For a pure study of projectile motion, the variables we're interested in are launch force, gravity, and launch angle. Air resistance does play a role, but we tend to ignore it for the sake of understanding at the elementary and middle school levels. At the high school level, it may be taken into consideration.
This month, we've got some fun activities that help explain the forces involved in rocket flight.