- #1

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I read an article where the author tried to find the maximal speed a car can have when taking a turn of certain radius. They represented the car as a point and claimed that the force of friction is the centripetal force - acting perpendicular to the trajectory of the car.

I do understand why friction is the force that propels the car. What I don't understand is: Why is the net force acting on a car perpendicular to its trajectory?

I have drawn this diagram:

The rectangle is the car.

The green segments are the wheels.

What is wrong with my diagram?

I do understand why friction is the force that propels the car. What I don't understand is: Why is the net force acting on a car perpendicular to its trajectory?

I have drawn this diagram:

The rectangle is the car.

The green segments are the wheels.

What is wrong with my diagram?