As far as I know, the "On" button is electronic rather than physical. The gearshift is also just sending instructions to a computer: it doesn't even stay in position after you've used it. And I honestly don't know how the break pedal works: it somehow swaps over from magnetic regenerative breaking to traditional friction brakes at some point, but I'm not sure to what degree that's electronic vs. mechanical.
All of these functions are electronic on the Prius (and indeed on every hybrid car that I know of that's on the roads). The balance between regenerative and regular friction braking in particular requires quite a bit of computer code and calibration to get right.
All of these functions are electronic on the Prius (and indeed on every hybrid car that I know of that's on the roads). The balance between regenerative and regular friction braking in particular requires quite a bit of computer code and calibration to get right.