When you step on the accelerator to increase the speed of your car, the force that accelerates the car is eitheir the force of your foot on the accelerator, the force of friction of the road on the tires,the force of the engine on the drive shaft, or the normal force of the road on the tires.
I thought the force of the engine on the drive shaft. I am really not sure.I don't think it is your foot on the accelerator or normal force of the road on the tires.
If you were on ice, stepping on the accelerator would not move the car as fast: Perhaps you need to think on the friction between the tire and road.
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