* Average motion: While the particles within an object are always moving, their motion is random and chaotic. This means that their movements are in all directions and at varying speeds. On average, the movement of the particles in a solid object cancels out, resulting in no net movement of the object itself.
* Forces of attraction: The particles within a solid are held together by strong forces of attraction. These forces prevent the particles from moving very far apart, keeping the object in a fixed shape and position.
* Large scale: We perceive the world on a macroscopic scale. The movement of individual particles is far too small to be observed with our naked eye. To see the individual particle movement, you would need a powerful microscope.
Think of it like this: Imagine a crowd of people at a crowded party. Each person is moving around randomly, bumping into others. While there's a lot of individual movement, the overall crowd remains relatively stationary because everyone's movement is balanced out.
However, things can change:
* Temperature: If you heat up the table or cup, the particles within it will move faster. This can cause the object to expand slightly, as the particles have more energy to overcome the forces holding them together.
* External forces: If a force is applied to the object, like pushing or pulling on it, it will overcome the forces holding the particles together and the object will move.
So, while the particles within an object are always moving, their movement is random and balanced, and the forces holding them together are strong enough to keep the object in a fixed position unless acted upon by an external force.
