ܝܠܝܐ Activity 3: Balloon Rocket (5 pts) Objective: Describe how a balloon rocket works and how conservation of momentum explains rocket motion. Materials: balloon (long shape) drinking straw, string (nylon, if available) tape Procedure: 1. Stretch the string over two posts. You can use chairs or iron stands as posts. Make sure that the string is taut. 2. Inflate the balloon. Twist the open end and temporarily secure it with a paper clip. 3. Tape the straw to the balloon such that it is aligned with the balloon's opening (see Figure 3). Figure 3. Balloon rocket set up. 4. Draw a diagram showing the momentum vectors of your balloon rocket and the air.​