The last car moved by strain energy.
Today they are making a motorized car to run by hand generated energy saved in a capacitor..
I have three different kinds of motors.
The first build of the car is with the large motor.
The generator on the lowest gearing can work to move the car.
A nearly full charge moves the car less than 2 feet.
We changed the car to the small motor.
It went much farther.
With 100 Joules
the car with the lamps went 13 feet.