University of Virginia
University of Virginia: Projectile Motion
Applet site that allows the user to change various inputs and then see how the object will fly when launched. Applet even allows for air resistance.
Walter Fendt
Walter Fendt: Projectile Motion
A short interactive activity to show the movement of a projectile. You can change the values of the initial height, velocity, angle of inclination, the mass and the gravitational acceleration.
Science Struck
Science Struck: How Does an Ancient and Modern Catapult Work
A short explanation of how a catapult works and some examples of them.