The launch angle is the direction the ball travels (relative to the ground) when it is launched. The pull-back angle is how far you pull the launch arm back before you launch the ball. The catapult is powered by rubber bands, which connect the launch arm to the "disk." The disk makes it easy to measure and set the launch angle and the pull-back angle. The ball (either a ping pong ball or a Wiffle® ball) sits in a cup at the end of the "launch arm," which is attached to the base. The base of the catapult, shown in Figure 1 above, is attached to a surface (such as the edge of a table) with a clamp. Note the paper towels between the surface of the table and the base of the catapult to avoid scratching the table. The catapult with all of its parts labeled.
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