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Use things like a leaf blower, plastic lid, and shower curtain to make a basic hovercraft that floats on a cushion of air. This shows principles of friction, air pressure, and propulsion.
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Use wood, metal and springs to create a machine that automatically launches or pitches balls. This applies concepts of mechanical energy, springs, and levers.
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Use lenses, cardboard tubes, and other supplies to build a basic refracting telescope. This shows principles of optics and magnification.
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Use a spring, weight, pen, and paper to detect vibrations and create seismograph readings. This demonstrates principles of inertia, springs, and oscillations.
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Use circuits, batteries, magnetic coils and projectiles to accelerate a magnetic projectile. This applies principles of electromagnetism and magnetic fields producing motion.
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Design a robotic arm from materials like wood, motors, and light sensors that can grasp and move objects. This requires understanding gear trains, leverage, electronics and coding.