![]() Measure the launch angle by reading the tick mark that lines up with the bottom of the catapult base (on the right). In this picture, the pull-back angle is about 60 degrees. Measure the pull-back angle by reading the tick mark that lines up with the top of the launch arm (on the left). If you increase the number of rubber bands, what will happen to the launch distance?įigure 6.If you increase the pull-back angle, what will happen to the launch distance?.Which launch angle will cause the ball to travel farthest?.We have defined some of them for you in the Introduction, but you might need to look others up on your own. Terms and Conceptsīefore continuing with this project, make sure you understand the following terms and concepts. Think about how each of these things will change how the ball is launched, and which ones you will want to adjust to make the ball hit your target. The pull-back angle (from 0 to 120 degrees).The launch angle (from 0 to 75 degrees).The number of rubber bands (up to three).You can change four things to adjust how far the ball goes: The launch angle is the direction the ball is going when it leaves the catapult. The pull-back angle is how far back you pull the launch arm before you launch the ball. We will explain how to measure them in the Experimental Procedure.įigure 2. Figure 2 below can help you understand these angles. You set the launch angle by placing the pin through holes that line up on the disk and the base of the catapult. So, a launch angle of 90 degrees means the ball will go straight up, and a launch angle of 0 degrees means the ball will go horizontal. 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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