According to Newton's second law, acceleration is directly proportional to the summation of all forces that act on an object and inversely proportional to its mass. What's more, from the general theory of relativity, we know that the entire Universe is not only expanding, but it is even an accelerated expansion! That means that the distance between two points is constantly becoming greater and greater, but we can't feel that on an everyday basis because every scale in the world expands too.Īcceleration is the rate of change of an object's speed in other words, it's how fast velocity changes. You can feel it in an elevator when you become a little heavier (accelerating) or lighter (decelerating) or when you're riding down a steep slope on your sled in the snow.
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