The gears in the transmission aren’t actually turning, so why does a little gas keep me from rolling back but also not going forward?
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To do that you use an automatic gearbox. On a manual gearbox, you need to use the breaks or slipping the clutch, so you keep the car stationary primary by changing the clutch, not the accelerator.
Between the engine and gearbox, you have a Torque Converter where the connection is not a direct mechanical link but a device filled with oils where the engine rotates a pump and the gearbox is connected to the turbine and there is some other parts. You can learn more at [https://www.youtube.com/watch?v=bRcDvCj_JPs](https://www.youtube.com/watch?v=bRcDvCj_JPs) put what is important is that both sides do not need to rotate at the same speed and the engine can push on the input to the gearbox even if the gearbox do not rotate.
If the car starts to roll back the turbine in the torque converter will rotate backward too , to stop it from rotation there has to be enough pressure on it from the pump that the engine to drive
When you press down the accelerator the engine will increase the RPM and the pump will pump fluid with more force. So the pressure on the turbine is higher. If you press the accelerator just enough the force on the turbine from the car rolling backward will be the same as the force in the other direction from the pump the engine drive and as a result, there is no motion.
Put some light objects on a book and tilt the book until the object starts to slide. You can keep the object stationary at the same angle if you just blow on it with your mouth. You move the object up or let it slowly move down by controlling how hard you blow.
The air you blow is a fluid like the oil in the torque converter. So exactly like of you can keep a object stationary by blowing on it the engine can keep the car stationary even if the wheels are not spinning,
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