# Friction force problem for a 4 wheel drive Car [closed]

The car is a 4 wheel drive in equilibrium, the car doesn't touch the ground with the front wheel (A) but is in contact in B with the sidewalk (the sidewalk has a hight equal to $h$), the friction in point B and D are both equal to 0.8, and the weight of the car is equal to 18000 N, the question is can the car go up the sidewalk without run up.

I am unable to understand the solution in this picture which says yes , as long as point I is between M and N, the car can go up the sidewalk. But according to my understanding, in order for the car to move with kinetic friction, the angle between vector B or D and the normal line should be equal to φ Can you please help me? Many thanks

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## closed as off-topic by John Rennie, DavePhD, Brandon Enright, Danu, JamalSJun 8 '14 at 9:49

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