define kinetic energy and thermal energy. describe what happens to each as the temperature of a substances increases.
Kinetic energy is the energy of motion ; any object or particle that is moving has kinetic energy.
Thermal energy is the total kinetic energy of all the particles in a substance due to their random motion (vibrating, rotating, and moving from place to place).
Quick Scoop
As the temperature of a substance increases, the particles move faster.
When particles move faster, each one has more kinetic energy, so the total
thermal energy of the substance also increases.
Put simply:
- Higher temperature → particles move faster → more kinetic energy per particle.
- Because all those faster-moving particles add up, the substance’s thermal energy increases as well.
In many everyday situations (like heating water on a stove), raising the temperature means both the kinetic energy of the particles and the overall thermal energy of the substance go up together.
