The tractor evenly pulls the trailer along a horizontal road, developing a traction force Ft = 12kN. The friction force is …

Ft = 12kN.

According to 1 Newton’s law, a body is in a state of rest or uniform rectilinear motion, if other bodies do not act on it or the actions of other bodies are compensated.

Since the tractor drives uniformly in a straight line, the traction force Fт = 12kN is compensated by the friction force, which is directed in the opposite direction.

Friction force Ft = 12kN.



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