These project-based lessons focus on basic principles of physics, structural, and mechanical engineering. All projects in the collection use the same set of materials, so it's easy and cheap to buy in bulk and create many of these activities (links are provided in-lesson).
25 Engineering Projects for Kids, including candy towers, learning about domes, building sensory bins and a lego catapult
These simple engineering projects for kids by grade level are perfect for learning about STEM concepts, including engineering and math.