Contructing a projectile launcher and free falling target
Crossbow Launcher Project 2014 - YouTube
Tennis Ball Launcher (Personal Project) - YouTube
mechanical engineering - Torque required to launch a tennis ball - Engineering Stack Exchange
From the Community Stream: <p>This afternoon we went outside to do a simple machines obstacle course! We fired tennis balls… | Katapult, Holzprojekte, Holzspielzeug
Science Week Activity: Design and Build a Ping Pong Launcher – Nurture for the Future
Physics students test tennis ball launchers (10 photos, video) – The Foothill Dragon Press