Answer:
the direction of the friction force on the car is in the same direction to the VELOCITY of the car.
Step-by-step explanation:
When the brakes are applied on a moving car then the speed of the car reduces slowly. The slowing of speed and the stopping of car takes a certain time which is proportional to the force applied by the brakes.
The brakes when applied to the moving part on the axle of the vehicle be it either drum or the disc offers the resistance to the rotation of the wheels in the form of friction.
As we know that friction always acts in a direction opposite to the relative motion between the two surfaces. So does here in this case the friction of brakes acts in a direction tangentially opposite to the rotation at the point of application of the brakes.
Similarly, the friction between the tyres and the road acts in a direction tangentially opposite to the direction of the relative motion between the surfaces i.e. the tyres move backwards relative to the road surface and hence the friction acts in the forward direction and is in the same direction as the motion of the car.