How to Make a Giant Catapult

We’ve made lots of different small  catapults before, but never a big one until today. We had SO much fun with our giant catapult, and it provides lots of different investigation opportunties. Try using different size and weight balls, measure how far they travel, how high they go, could you dip the balls in paint and make some catapult art? Or use the paint to help measure where the balls land?


5 long sticks

2 smaller sticks


Catapult Elastic

Different size and shape balls to test

Small plastic container – we used a plastic Starbucks Frappuccino lid!



Build a frame using the sticks and string.

Cut three pieces of catapult elastic and attach evenly around a plastic container.

Attach the other ends of the elastic to the base and sides of the catapult structure as shown above.

How to make a giant catapult

Test your catapult out!

Investigation Ideas

Try using different size balls to investigate which travel the furthest. Can you predict what will happen first?

Construct a bigger and smaller catapult, does it make a difference?

Questions to ask

How will you measure the distance the balls travel?

What conditions do you need to keep the same?

What do you think would happen if you used a smaller or bigger catapult?

What would happen if you used less stretchy elastic?

How could you improve the design of your catapult?



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how to make a giant catapult

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