February 2021
Intermediate to advanced
184 pages
4h 7m
English
book
Timing for Animation, 40th Anniversary Edition, 3rd Edition
by Harold Whitaker, Tom Sito, John Halas
Content preview from Timing for Animation, 40th Anniversary Edition, 3rd Edition
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Newton’s Laws of Motion
Every object or character has weight and moves only when a force is applied to it. This is Newton’s first law of motion. An object at rest tends to remain at rest until a force moves it, and once it is moving it tends to keep moving in a straight line until another force stops it.
The heavier an object is, or strictly speaking, the greater its mass, the more the force is required to change its motion. A heavy body has more inertia and more momentum than a light one.
A heavy object at rest, such as a cannonball, needs a lot of force to move it (Fig. 16A). When fired from a cannon, the force of the charge acts on the cannonball only while it is in the gun barrel. Since the force of the explosive charge is very large indeed, ...
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