- #1
davon806
- 148
- 1
Homework Statement
When the wheels rotate backwards,a backward force is exerted on the ground by the tyres.
By 3rd law,a equal but opposite force acts on the tyre by the ground,so the car
accelerates.
But I have also found some websites that states static friction is the only external
force causing the car to move forwards.
In some typical physics questions,the driving force and friction are two different
forces act on a car,where friction is in the opposite direction of displacement.
I would like to ask which force is actually accelerating the car?Friction or reaction
force by the ground(due to the engine)?
If it is friction,why backward arrow is drawn in some textbooks to represent friction while
the car is accelerating forwards?