The temperature of a solid object can be thought of as a measure of how fast the particles making it up are moving back and forth—particles in a cold object are vibrating relatively slowly, while those in a hot object move very rapidly. When a cold object is put in contact with a hot one, the slow-moving particles gradually begin to move faster, which we see as heat flowing into the cold object. Materials that conduct electricity well also tend to conduct heat well (for example, metals are good conductors of both heat and electricity, while wood is a poor conductor of both). Can you explain this connection in terms of the physics discussed in the video?