Place the tip of a soft pencil on a blank sheet of paper on a smooth table. Keeping your pencil steady, try moving the piece of paper so that the pencil draws a circle. What is the trajectory of the pencil point relative to the table? regarding a sheet of paper? If you need help, ask one of your classmates or classmates.
A point relative to the table, a circle relative to a sheet of paper.
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.