Kinetic energy is energy from motion. So a car at rest has zero kinetic energy and will not be able to get moving.
Some cars (Teslas, Priuses, etc.) are able to recapture some kinetic energy with regenerative braking. When you brake in those cars, it recaptures some of the kinetic energy and charges the batteries, which can be used to accelerate the car. But you need a hybrid or electric car to do this, because you need batteries to accept this charge.
Energy is neither created nor destroyed but simply transformed.
This means that a stopped car can’t start moving without energy input to the system. This energy is stored chemically in gasoline, but I suppose you could also get a team of men to push the car utilizing energy stored in the human bodies.
Once the car is moving, forces like friction and air resistance are always working to slow the car down *by taking kinetic energy from the car*. You can’t add energy to the car by taking kinetic energy *from* the car. The energy needs to come from somewhere else.
Your question communicates a fundamental misunderstanding about energy and the impossibility of perpetual motion.
Latest Answers