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After assembling the product
reactive force makes car to go forward
1 X Hand crank generation model
1 X Compass
1 X Electromagnet
DIY Electric Butterfly STEM Kit jeep After assembling the productPrinciple: The mechanical butterfly is a very interesting kit. After assembling the product, install the battery and turn on the switch. Because the gear plate is connected to the butterfly wing plate, according to the principle of gear transmission, after electricity, the wings flap. Teaching Aid Mechanic Theory! Mechanic Engineering concepts for gears. Instructions in English included in package. Stem Toys are Science, Technology, Engineering, and
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