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3 definitions that we should not get confused
Temperature
- Average kinetic energy of particles of a substance.
- NOT the kinetic energy of the whole! Faster car does not necessarily mean higher temperature
- Does not mean all of the particles are the same
- Measured in Joules ($J$).
Internal Energy
- The sum of the potential and kinetic energy of the particles
- $E_{k} + E_{p}$
Heat
- Thermal("probably a mixture of kinetic and potential") energy which is transferred from a hotter object(i.e. one with the higher temperature) to a cooler one.
- The net direction of transfer is from hotter one to the cooler one.
- Recall that temperature is average. Although something's temperature is cold, it may have a small amount of high energy particles.
- Transfer occurs when particles collide
