It's not quite accurate to say that "matter flows" when force is applied. The concept of flow usually refers to the movement of fluids (liquids and gases). Here's a more accurate breakdown:

* Fluids: When force is applied to a fluid, it deforms and flows. Think of water in a pipe or air being blown by a fan. The force causes the fluid particles to move and rearrange, resulting in flow.

* Solids: Solids are more rigid. When force is applied to a solid, it deforms but doesn't flow like a fluid. The amount of deformation depends on the material's elasticity and the force applied.

* Pressure: Force applied over an area creates pressure. Pressure is a key factor in causing fluids to flow.

In summary:

* Flow primarily applies to fluids (liquids and gases) when force is applied.

* Solids can deform under force but don't "flow" in the same way.

* Pressure, created by force, is a major driver of fluid flow.