https://www.physicsforums.com/threads/friction-questions-how-does-a-car-turn.150321/ I have a doubt regarding the following line of post 6 of the above particular thread According to below lines of the mentioned post The applied force will accelerate the box towards the north, so it will move in a curve. The friction force is always along the tangent to that curve and opposite to the direction the box is moving. So the component of friction force in the south direction will increase and the component in the west direction will decrease. the diagram would be But the below lines of the very same post If your box is moving east, the dynamic friction force is towards the west. If you suddenly apply a force towards the north at time t=0, the dynamic friction force at t=0 will still be towards the west. Are contradictory of my diagram this is my opinion ,I think I am wrong I am missing something.Please guide me.