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reactive force makes car to go forward
1 X Hand crank generation model
https://simplebooklet
15V)5 x Lightbulb3 x Lightbulb Holder3 x Switch3 x Battery Holder1 x Resistor Module (5-Ω
it is durable and reliable
DIY Electric Butterfly STEM Kit jeep reactive force makes car toPrinciple: 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
