Check out these projectile motion activities...
Blast an apple through the air. Gaze in stunned amazement as the vectors develop over time!! Seriously, though, select and deselect the vectors and vector components in order to develop an understanding of the velocities and accelerations acting upon the apple.
Shoot stuff, and change angle, mass, velocity, with and without air resistance. Use this applet to determine if you can correctly calculate distances, maximum height, and velocities of a projectile under ideal conditions (no air resistance). The effect of air resistance can also be observed.
Change and observe more variables in this applet.
Super easy to understand, with conceptual check, animations, etc
A special case of projectile motion, where a cannon is placed on top of a mountain. What happens?
Another version of Newton's Cannon, with more information.
Answer the four questions as part of this cannon experiment.
Projectile Motion Problem Set #1
Projectile Motion Problem Set #2
Projectile Motion Problem Set #3