Place the block with which we did the first experiment on a face with a smaller surface area and also observe the dynamometer reading. Compare the results obtained in the first and second experiments.
If the bar is placed on a face with a smaller surface area, the friction force will be less and we will need to apply less force to move the bar.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.