Dynamics are related to the louds and softness in music. On the piano, the most effective way to display dynamics is the way the keys are struck. The harder they are struck, the louder you play, and vice versa.
Dynamics refer to loudness. The piano's real name is "piano-forte" which in Italian means "soft-loud." To play softly, strike the keys softly. To play loudly, use more force.
