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Cartoon physics

Jocular system of physical laws for animated cartoons

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Many of the most famous American animated films, particularly those from Warner Bros. and Metro-Goldwyn-Mayer studios, indirectly developed a relatively consistent set of such "laws" which have become de rigueur in comic animation. They usually involve things behaving in accordance with how they appear to the cartoon characters, or what the characters expect, rather than how they objectively are. In one common example, when a cartoon character runs off a cliff, gravity has no effect until the character notices there is nothing under their feet.

In words attributed to Art Babbitt, an animator with the Walt Disney Studios, "Animation follows the laws of physics—unless it is funnier otherwise."

Examples

Specific reference to cartoon physics extends back at least to June 1980, when an article "O'Donnell's Laws of Cartoon Motion" appeared in Esquire. A version printed in V.18 No. 7 p. 12, 1994 by the Institute of Electrical and Electronics Engineers in its journal helped spread the word among the technical crowd, which has expanded and refined the idea.

O'Donnell's examples include:

  • Any body suspended in space will remain suspended in space until made aware of its situation. A character steps off a cliff but remains in midair until looking down, then the familiar principle of 16 feet per second squared takes over.
  • A body passing through solid matter will leave a perforation conforming to its perimeter called the silhouette of passage.
  • The time required for an object to fall 20 stories is greater than or equal to the time it takes for whoever knocked it off the ledge to spiral down 20 flights to attempt to capture it unbroken. Such an object is inevitably priceless; the attempt to capture it, inevitably unsuccessful.
  • All principles of gravity are negated by fear.
  • Psychic forces are sufficient in most bodies for a shock to propel them directly away from the ground. A spooky noise or an adversary's signature sound will introduce motion upward, usually to the cradle of a chandelier, a treetop or the crest of a flagpole.
  • The feet of a running character or the wheels of a speeding auto need never touch the ground, ergo fleeing turns to flight.
  • As speed increases, objects can be in several places at once.
  • Certain bodies can pass through a solid wall painted to resemble tunnel entrances; others cannot. ... Whoever paints an entrance on a wall's surface to trick an opponent will be unable to pursue him into this theoretical space. The painter is flattened against the wall when he attempts to follow into the painting. This is ultimately a problem of art, not science.
  • Any violent rearrangement of feline matter is impermanent. Cartoon cats can be sliced, splayed, accordion-pleated, spindled or disassembled, but they cannot be destroyed. After a few moments of blinking self-pity, they reinflate, elongate, snap back or solidify.

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