DIY Popsicle Stick Catapult: A Fun Hands-On STEM Project for Kids

Looking for a fun and educational activity that keeps kids entertained while encouraging creativity? This DIY popsicle stick catapult is a simple science and engineering project that children can build using everyday craft supplies.

With just a few wooden craft sticks, rubber bands, and a plastic spoon, kids can create a mini catapult and explore how stored energy helps launch lightweight objects. It is an excellent hands-on activity for classrooms, science fairs, rainy afternoons, or family craft time.

The best part is that children can experiment with different launch angles, test various lightweight projectiles, and improve their designs while learning basic STEM concepts.

Why Kids Will Love This Catapult Project

This project combines crafting, problem-solving, and simple physics in one exciting activity. Children can practice following instructions, developing fine motor skills, and making predictions about how their catapult will perform.

It also introduces important STEM concepts, including potential energy, motion, force, and engineering design. Adults can help younger children assemble the structure and supervise all testing.

Materials You Will Need

Gather these simple supplies before starting:

10–12 wooden popsicle sticks or craft sticks
5–8 sturdy rubber bands
1 plastic spoon or lightweight wooden spoon
Small pom-poms or soft paper balls for launching
Craft glue, optional for extra reinforcement
A small ruler for measuring launch distance
Paper and pencil for recording experiment results

Safety note: Use lightweight, soft projectiles only. Avoid marbles, hard objects, or anything that could injure someone. Never aim the catapult at people, animals, or breakable objects.

Step 1: Build the Base

Start by placing four popsicle sticks together to form a flat, sturdy base. Arrange them in a small rectangular shape or stack them neatly, depending on the design you prefer.

Use rubber bands to secure the ends and keep the sticks from moving apart. Check that the base sits flat on the table.

A stable base is important because it helps prevent the catapult from tipping over when the launching arm moves.

Step 2: Create the Support Structure

Take two additional popsicle sticks and place them together. Secure one end with a rubber band.

Gently separate the other ends to create a small V-shaped support. Position this support over the base so it can hold the launching arm.

Use additional rubber bands to attach the support securely to the base. Ask an adult to help if the rubber bands are difficult to stretch.

Step 3: Attach the Launching Arm

Take another popsicle stick and place the plastic spoon near one end. Secure the spoon to the stick with rubber bands, making sure the spoon bowl faces upward.

Position the launching arm over the support structure. Attach it loosely enough to allow the arm to move up and down while keeping the assembly stable.

The spoon will hold the pom-pom, while the stick acts as the lever that launches it.

Step 4: Reinforce the Catapult

Inspect the structure and check that the base, support, and launching arm are firmly connected.

Add rubber bands where necessary to prevent the sticks from slipping. Make sure the spoon is securely attached and that the launching arm can move without becoming detached.

Test the movement gently with an empty spoon before adding a projectile.

Step 5: Load and Launch

Place one small pom-pom in the spoon bowl. Hold the base firmly against the table with one hand.

With the other hand, gently press the launching arm downward. Release it carefully and watch the pom-pom move forward.

Start with a small movement rather than pulling the arm back too far. Adjust the design if the spoon slips or the base moves during the test.

Step 6: Experiment with Different Launches

Now comes the scientific part! Try launching pom-poms of similar size using different starting positions.

Change one variable at a time, such as the angle of the launching arm or the placement of the support. Measure how far the pom-pom travels and record the results.

Ask children to predict which adjustment will produce the longest distance before conducting each test.

How Does a Popsicle Stick Catapult Work?

A catapult demonstrates the relationship between stored energy and motion.

When the launching arm is pressed down, the structure and its elastic components store energy. When the arm is released, that energy is transferred into movement, helping propel the lightweight projectile.

The projectile's flight also depends on factors such as its weight, the launch angle, friction, and the stability of the base.

This simple model gives children an accessible introduction to physics without needing complicated equipment.

Fun STEM Challenges to Try

Challenge 1: Find the Best Launch Angle

Try several starting angles and record the distance traveled by each pom-pom. Keep the projectile and release method consistent so the results are easier to compare.

Challenge 2: Improve the Stability

Experiment with different base arrangements. Observe whether a wider or more securely fastened base helps the catapult remain steady.

Challenge 3: Measure the Distance

Place a measuring tape on the floor or table in a clear testing area. Record the distance of each launch and compare the results.

Challenge 4: Make a Design Improvement

Invite children to identify one problem with their catapult and suggest a solution. They might strengthen the base, adjust the support, or secure the spoon more effectively.

Tips for a Successful Project

Use craft sticks that are smooth and free from splinters.
Choose rubber bands that are sturdy and in good condition.
Secure the spoon carefully so it does not detach during testing.
Use soft pom-poms or paper balls rather than hard projectiles.
Test the catapult on a stable surface with plenty of open space.
Change only one design feature at a time when comparing results.

Safety Guidelines for Children

Adult supervision is recommended throughout the activity, especially when stretching rubber bands or assembling the structure.

Keep fingers away from moving parts, do not overstretch the rubber bands, and stop using any damaged sticks or bands. Launch only soft, lightweight objects into a clear area, away from faces, pets, and fragile items.

Final Thoughts

Making a DIY popsicle stick catapult is a creative way to combine arts and crafts with science and engineering. Using a few inexpensive supplies, children can build a simple model, test how it works, and learn from every experiment.

Whether you use it for a classroom STEM lesson, a weekend craft, or a family science activity, this project encourages curiosity, creativity, and problem-solving through hands-on learning.

Gather your craft sticks, prepare a few soft pom-poms, and let the building and experimenting begin!