Catapults - a classic and exciting engineering project that introduces students to fundamental ideas in physics and engineering like energy transformation, trajectory, and structural strength.

You can find the lesson plan, 1-page project sheet, and more project ideas at STEM-Inventions.com

Step 1: Materials

The Engineering Creation Kit has everything you need for this project and many more from STEM Inventions.

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Step 2: Class 3 Catapult

To fire:

Load the projectile
Firmly hold down the front of the catapult
Pinch the cube under the basket and pull down, then release

Step 3: Class 1 Catapult

To fire:

Load the projectile
Hold down the base from inside the support structure
Firmly and quickly press on the lever. Do not strike the lever with a fist or other object or the hinge may break

Step 4: Slingshot

To fire:

Load the projectile
Firmly hold the front of the slingshot, or grasp the front of the slingshot as shown in the video
Pull back on the sling and release

Step 5: Advanced Ideas

A straightforward advancement of the Catapult project is to add two baskets instead of one.

A wacky design, dubbed the Confused Catapult, incorporates two catapult arms onto one frame. Making catapult arms of different lengths allows the user to enjoy a wider range of trajectory options.