Why Time is considered a 4 th dimension ? Why Gravity cannot be considered as a dimension ? What is a 5th dimension ?
In: Physics
Think of each dimension like a part of a set of coordinates. To find an object’s location on the surface of the Earth you’d need to know its location in the physical dimensions (on the surface of the Earth those would be latitude longitude and altitude), but those would be useless if the object is moving. In that case you’d also need to know the time when it will be at that physical location.
If you could view an object in the 4th dimension it would look like one large object that is a combination of all the physical locations that object has ever been in starting from the beginning of its existence to when it is destroyed. Pick any point along its lifetime and it’ll be on a line, with the past going one way and the future going the other. This is just like the other dimensions except the object’s traversal of the 4th dimension can only go in one direction, and at a fairly constant velocity.
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