Any power you get from doing that will come ultimately from the gasoline in the engine. If you think you could get something "free" in this way, you are mistaken.rasen58 said:
I don't think it would be that free, just reclaiming some of the energy used.phinds said:
Oh okay. But, would the slowing down and speeding up of a car be able to produce the change of force?Jobrag said:
But you would NOT be "reclaiming some of the energy used", you would be requiring the use of MORE gas and wasting some of it in various inefficiencies to get an end result that you can already get from the car's alternator. Your statement makes me think that you DO somehow believe that there would be something free involved.rasen58 said:
Ah ha ! You DO think it's free energy. Certainly, you could generate energy but this would be at the expense of the kinetic energy of the car, as provided by the gas engine. If you wanted to keep the car running at the same speed as it would if you were not harvesting energy the way you suggest, you would have to supply more energy via the engine. Can you not see that were it otherwise this would be free energy? Free energy leads to perpetual motion machines. They don't work.rasen58 said:
Adding such a device would reduce the aerodynamic efficiency of the car/increase drag.rasen58 said:
Correct ... it would be a net loss of energy, as I have said repeatedly.rasen58 said:
phinds said:
... 
Piezoelectricity is the ability of certain materials to generate an electric charge when subjected to mechanical stress. This is due to the arrangement of positive and negative charges within the material, which causes a separation of charges when the material is compressed or bent. This electric charge can then be harnessed and used as a source of energy.
By placing piezoelectric materials on the surface of a car, the airflow caused by the car's movement will put pressure on these materials, creating an electric charge. This charge can then be collected and used as a renewable source of energy to power various systems in the car.
Using piezoelectricity from wind on cars can provide a renewable, clean source of energy without the need for fuel or maintenance. This can reduce the carbon footprint of cars and decrease the use of non-renewable resources. It can also potentially increase the energy efficiency of vehicles and reduce their overall environmental impact.
One challenge is finding the right materials that can withstand the stress and strain of being on a moving car while still being efficient at producing electricity. There may also be limitations in terms of the amount of energy that can be harnessed from wind on cars, as well as the cost and practicality of implementing this technology on a large scale.
While this technology is still in its early stages, there are some companies that have developed prototypes and are testing them on cars. Some examples include the use of piezoelectric materials on the surface of tires to generate electricity or in the form of small wind turbines attached to the car's body. However, more research and development is needed before widespread implementation can occur.