Is the static friction force between the car and the ground equal to the weight of the car itself?

Not equal to
But what I said upstairs is not complete
If the constant speed driving is not static friction, although in high school when dealing with this kind of problem, the two are approximately equal
When turning at a constant speed, it should be equal to the resultant force of traction and centripetal force
(one part is balanced with the traction force to keep the speed unchanged, and the other part acts as a centripetal force to change the direction of speed)

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