How does the size of the force exerted by earths gravity on a car compare with the force the car exerts on earth?

The size of the force exerted on the car is larger than the force the car exerts on Earth. Gravity is acting on the car but the car is moving perpendicular to the motion of gravity. So it is exerting almost no force on Earth.

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stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.