Final answer:
The statement is false; particles within matter move at different speeds depending on the temperature, in accordance with the kinetic theory of matter.
Step-by-step explanation:
The statement that particles moving at the same speed make up all matter is false. In reality, the kinetic theory of matter explains that all matter is composed of particles (atoms and molecules) which move at different speeds depending on the temperature. The temperature is a measure of the average kinetic energy of these particles. In solids, particles are in a constant state of vibration but do not move freely. In liquids, particles slide past each other, and in gases, they move quickly and are relatively far apart from one another.
For example, the motion of particles in a hot cup of coffee is much more rapid than in a cold one, reflecting the increase in temperature and, consequently, the average kinetic energy of the coffee's particles. Therefore, the speed of the particles within a given substance can vary widely, and this variability is critical to understanding the behavior of matter in different states and conditions.