Timing and spacing in animation

This exercise showed us the difference between smooth movements and movements that ease in and out.

This ball moves evenly

This one starts and ends slowly, but speeds up in the middle

This swing moves evenly along an arc

This one eases in and out like before along it's arc

This one moves in a straight line. This isn't right because things swing in an arc, and this one does not.

When organic things move, their movements are usually a series of different arcs.