3. A teacher points to a microscope sitting on the desk. Which conclusion best explains why the microscope is not moving? F. There are many forces acting on the microscope, but mostly it is its inertia that keeps it on the desk. G. Gravity is pulling on the microscope. It is only the weight of the scope that keeps it from moving off the desk. H. There is only one force, air pressure, acting on the microscope. The air in the room is pressing on the scope keeping it on the desk. J. There are two forces acting on the microscope. The desk is pushing up and gravity is pulling down. The balance of these forces keeps the microscope from moving