The forces acting on a test body inside a hoop, a hollow sphere and between two massive points are considered. As you move away from the center of the system, the force of attraction increases from zero to a certain maximum. The statement about the absence of gravitational forces inside a hollow sphere is erroneous. The forces acting on a test body inside a hoop, a hollow sphere, and between two massive points are considered. With distance from the center of the system, the force of attraction grows from zero to a certain maximum. The statement about the absence of gravitational forces inside the hollow sphere is erroneous.