Classify the following as motion along a straight line, circular or oscillatory motion: Motion of a child on a see-saw.

The motion of a child on a see-saw is oscillatory. As the child sits on one end, the see-saw moves up and down around a central pivot. The child’s movement involves a repetitive back-and-forth motion, swinging alternately upward and downward. This rocking motion between two extremes defines the oscillatory nature of the see-saw’s movement, providing the child with a fun and repetitive swinging experience while playing on the apparatus.