To determine which substances are cooling down, we need to look for the ones indicating a decrease in motion or kinetic energy of their particles over time.
- Substance W: "moving around and vibrating, getting slower over time" - This indicates that the particles are losing energy and slowing down, suggesting cooling.
- Substance X: "vibrating, getting slower over time" - This also indicates a decrease in energy and motion, suggesting cooling.
- Substance Y: "moving around and vibrating, getting faster over time" - This indicates that the particles are gaining energy and moving faster, suggesting heating rather than cooling.
- Substance Z: "vibrating, getting faster over time" - This also indicates an increase in energy and motion, suggesting heating rather than cooling.
Based on this analysis, the substances that are cooling down are:
- Substance W
- Substance X
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