Arc
Most natural movements follow a curved path rather than a straight line. This principle is called an arc. For example, a character waving their hand or a ball bouncing follows a smooth curve. Animating along arcs gives actions a fluid and organic look, which is more visually appealing than straight-line motion.
The difficulty is that straight-line movements are often easier to draw but can make animation look mechanical. Planning arcs requires careful attention and practice to get them smooth and natural.
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