Here's why:

* True: The forces between particles in a solid (like strong electrostatic forces) are indeed very strong. They keep the particles in a fixed, rigid structure, preventing them from easily moving around.

* Nuance: While the particles don't change positions freely like in a liquid or gas, they do vibrate around their fixed positions. This vibration increases with temperature.

In summary: The forces between particles in a solid strongly restrict their movement, making them appear fixed. However, they do vibrate in place, and this vibration becomes more significant as the solid gets hotter.