A bar with equally processed edges, the areas of which are 10 cm2, 20 cm2 and 40 cm2, are evenly moved over the table, applying a horizontally directed force. Does the modulus of this force depend on which edge the bar touches the table?
With uniform movement, the friction force is equal to the force with which the bar is pulled. Because the friction force does not depend on the surface area, then the traction force does not depend on the surface area.
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