My car felt like I got hit then wouldn't move when pressing the gas

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. It sounds like your Terrain may have experienced a severe drivetrain mechanical issue. The grinding noise, the car not moving when in gear, and still moving when in park are signs that something might be wrong with the transmission or its related components. It could be anything from a transmission failure to a broken axle or driveshaft If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!