Do viscosity is the inward force among the molecules of a liquid?

Viscosity is not an inward force itself, but rather a measure of a liquid's resistance to flow, which arises from the internal friction between molecules. This friction is due to intermolecular forces, such as van der Waals forces and hydrogen bonding, that act between the molecules. As these forces resist the movement of the molecules past one another, they contribute to the overall viscosity of the liquid. Thus, while viscosity reflects the effects of these intermolecular forces, it is not an inward force like cohesion or adhesion.