With the help of a dynamometer, he moves the bar evenly. What is the sliding friction force between

With the help of a dynamometer, he moves the bar evenly. What is the sliding friction force between the bar and the table, if the dynamometer shows 0.5 N.

According to Newton’s 1 law, a body can be at rest or in uniform rectilinear motion if no forces act on it or the action of forces is compensated. Since our bar is pulled by a dynamometer, it means that a traction force is applied to the body, with which we pull the bar. But since the bar moves evenly, this force is compensated by the friction force. The modulus of the friction force is equal to the force shown by the dynamometer and is directed in the opposite direction. Therefore, the sliding friction force is 0.5N.