How do tempo and dynamics interact to create the overall mood and expression in a musical piece?

Tempo and dynamics work together in a musical piece to influence the mood and expression. Tempo, or the speed of the music, can affect the energy level and intensity. Dynamics, or the volume of the music, can create contrast and emotion. By changing tempo and dynamics, composers can shape the overall mood and expression of a piece, evoking different feelings and reactions from the listener.