Blast Off! Building and Launching Straw Rockets
Materials Needed:
- Drinking straws (standard size)
- Wider straws (like smoothie straws, for launching)
- Cardstock or stiff paper
- Scissors (safety scissors recommended)
- Tape
- Modeling clay or play-doh (small amount)
- Measuring tape
- Pencil and paper (for recording distances)
Lesson Steps:
- Introduction (5-10 minutes): What Makes Rockets Fly?
Ask: "Have you ever seen a rocket launch? What makes it go up so fast?" Introduce the idea of THRUST - a strong push! Explain that rockets push gas out the bottom very fast, and this pushes the rocket up. Today, our breath pushing air through the straw will be the thrust for our own mini-rockets! - Build Your Rocket (15-20 minutes):
(Teacher demonstrates each step, allow student to follow along. Offer choices like fin shape/color.)
a. Take one standard straw. This is your rocket body. Pinch one end closed and seal it securely with a small piece of tape.
b. Roll a tiny ball of clay/play-doh (pea-sized) and press it onto the sealed end of the straw. This is the nose cone. Make it somewhat pointy.
c. Cut out small triangles or other shapes from the cardstock for fins (at least 3). Fins help the rocket fly straight.
d. Tape the fins evenly spaced around the open end of the straw. Make sure they stick out straight.
(Allow a short movement break if needed before launching.) - Prepare the Launcher (2 minutes):
Take the wider straw. This will be your launcher. Make sure the rocket straw slides easily over it but isn't too loose. - Launch Time! (15-20 minutes):
a. Find an open space (indoors or outdoors). Mark a starting line on the floor/ground.
b. Place the rocket straw (the one you built) over the end of the wider launcher straw.
c. Aim the rocket (NEVER at people or pets!).
d. Take a deep breath and blow a sharp puff of air into the open end of the launcher straw. Watch your rocket fly!
e. Use the measuring tape to measure the distance from the start line to where the rocket's nose cone landed. Record the distance.
f. Launch two more times, measuring and recording each time. See if you can beat your best distance! - Discussion & Improvement (5-10 minutes):
Look at your distances. Ask: "What made the rocket fly?" (Thrust from your breath!) "Why do you think it needs fins?" (To fly straight - aerodynamics). "How could we make it fly EVEN farther? What change could we make to the design?" (Examples: different fin shape/size, different nose cone weight/shape, smoother tape job). Encourage the student to pick ONE idea to try. - Optional Modification & Retest (10+ minutes):
Make the one change the student suggested (e.g., trim fins, add more clay, remove clay). Launch 3 more times and record the distances. Ask: "Did the change help? Why do you think that is?" - Wrap-up (2 minutes):
Connect this activity back to real rockets. Explain that scientists and engineers do lots of testing and changing designs (just like we did!) to make rockets that can travel all the way to space, the Moon, and other planets!