From the course: Animation Foundations: Fundamentals
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Momentum and mass
When we take a closer look at the loss of motion, we'll see that force and mass are intimately related. The more mass of an object, the harder it is to accelerate. In other words, heavy objects are hard to move. That's pretty obvious. So heavy objects will take longer to get up to speed and longer to stop. Lighter objects can obviously change direction more quickly. In animation, objects have no inherent mass. They're basically drawings or groups of pixels on the screen; they're images. The audience might be able to make a guess about how massive an object is by its image. But until it moves, they're really only guessing. Here we have two simple objects. Until the objects move, we have no idea how massive each one is. When this ball bounces off an object, we perceive it as light. This is also good demonstration of the third law of motion, equal and opposite reacition. When this ball moves through other objects, we perceive it as heavy. The ball itself didn't change. The only thing…
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