![]() Why is that? Well, it's because of gravitational forces that acts on every particle that has mass. If you hang an object on the accelerometer, it will show a non-zero value. We can measure acceleration experienced by an object directly with an accelerometer. If you've ever wondered what the physics behind space travel are, look at this Tsiolkovsky rocket equation. This is not true in a situation when the mass also changes, e.g., in rocket thrust, where burnt propellants exit from the rocket's nozzle. When the force changes, acceleration changes too, but the magnitude of its change depends on the mass of an object. ![]() This acceleration definition says that acceleration and force are, in fact, the same thing. It's all common sense - if several different forces are pushing an object, you need to work out what they add up to (they may be working in different directions), and then divide the resulting net force by your object's mass. 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 objects 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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