Answer:
Dynamics refers to the branch of mechanics that deals with the movement of objects and the forces that drive that movement. If you're taking a physics class, you will likely study dynamics.
Timbre, also known as tone color or tone quality, is the perceived sound quality of a musical note, sound or tone. Timbre distinguishes different types of sound production, such as choir voices and musical instruments.
Rhythm, the placement of sounds in time. In its most general sense, rhythm (Greek rhythmos, derived from rhein, “to flow”) is an ordered alternation of contrasting elements.
Melody, also tune, voice or line, is a linear succession of musical tones that the listener perceives as a single entity. In its most literal sense, a melody is a combination of pitch and rhythm, while more figuratively, the term can include successions of other musical elements such as tonal color.
