When a car is driving up a hill, is the friction between the tires and the ground static friction or kinetic friction?
If you are not spinning your wheels on the pavement, it is static friction between the tire and ground. If the wheels start spinning, it is kinetic friction.
Since static friction provides a greater frictional force than kinetic friction, spinning tires should be avoided. That is the theory behind ABS braking, and why you shouldn't just spin your tires faster when trying to move on slippery pavement.
Paul Walorski, B.A., Part-time Physics/Astronomy Instructor
'In a way science is a key to the gates of heaven, and the same key opens the gates of hell, and we do not have any instructions as to which is which gate.
Shall we throw away the key and never have a way to enter the gates of heaven? Or shall we struggle with the problem of which is the best way to use the key?'