After your great week "away from it all" you come back to your home in Minnesota to find it has snowed ....?

and your driveway is covered in ice. you park on it anyhow and go inside to fall asleep in front of the tv to watch the vikings lose another one. that night you dream about hearing a great crash and seeing the front end of an 81 datstvun where your set used to be your dad is peeved and he can't understand how this could have happened since you in your infinite wisdom remembered to even set the parking brake. SO your explain.....(boy, i hope this is a dream!) your remember that your car weighs 2800 pounds and that the ice supplies 800 pounds of force to keep your car fro moving. you recall that the driveway is 20 m long and has a 5.2m vertical drop in it. was this all a dream or are you now really up a creek without a backpack?