why can’t electric cars be charged by their own movement?
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I think some of them are to an extent. They do use the motion of the car to recharge. However, due to friction, no machine is perpetual. If the engine expels 100 kw of power, then perhaps only 95 kw actual transfers to moving the car forward. That 95 km could then (at best) charge to battery, but again power is lost so now the battery as 90 kw. So now the car engines has 90 kw of power, but only 85 kw goes to motion. That 85 kw of motion charges to battery to 80 kw. This will continue to decrease until the car runs dry.
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