to make this car the things that you will need are:-
1.a old car that has it motor of rear wheels and front turning motor
2.you need 2 of 9volt batteries
3.2 or 1 meter wire,that could be any wire bell wire,etc.
4.1 switch or 2 for the front wheels.
5.tou can use sholdering iron but if you dont you can use electric tape
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If you see in the old car that you are using for the car you will have a motor,
with that your car runs.
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Putting DC motors under water is an old trick, actually. When you buy a high powered RC motor, for example, it is a good idea to connect it to a battery and run it in a cup of water to clean all the junk out of it. Then you run it in a cup of light oil to relube it. Not relubing it will cause all kinds of trouble in the motor eventually.
The only thing in this project that could be a safety hazard is the battery. Water and the chemicals inside the battery can cause all kinds of reactions. Lithium and water can cause huge explosions.