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Christ Church (Erith)

C of E Primary School

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Trip to the Science Museum - 21/11/18

Today Leicester Class have been to the Science Museum and learnt all about the mgical properties of various materials. We also had the opportunity to enlist the help of some real life engineers to help us construct our very own catapults.


Here are a set of instructions for the catapults that we made. Try it yourself.


Step 1: Slap five craft sticks together, and rubber band them at both ends, wrapping the rubber bands until tight. You can add more or take some away later to test different build designs.


Step 2: Take your two remaining craft sticks, and rubber band them at one end. Wedge the fulcrum in the middle so they splay apart. You can change the lever length of your catapult by moving your fulcrum to different positions. This is great for learning about leverage.


Step 3: Use two rubber bands to make an "X" around the entire flinger and fulcrum. Leave it loose enough so that you can change the lever length when you want to.


Step 4: Be it plastic egg, bottle cap, clay, or folded paper, hot glue it to the end of the flinger. Load it up with some projectiles, pull back, aim (not at humans or animals), and fire away!


After you fling a few pom-poms around, try making some targets out of paper or cups, and adjust the fulcrum height and lever length to play with different designs.


Which lever length works the best? How does it change the flight path of the pom-pom?

Have fun, and keep exploring!