Why does your car sometimes move forward after taking your foot off the brake and sometimes not?
In: Engineering
* Most car engines run all the time, even when the car is stopped.
* This is called “idling” and it’s almost the same as pressing the gas pedal down just a tiny bit.
* There is a special device that allows the engine to keep spinning even though the wheels aren’t.
* It reacts to the resistance of the breaks and prevents the engine from trying to over power the force of the brakes.
* However once you let up on the brakes, the device re-connects the engine and if that idle power is enough to make the car move, then it does.
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