how we can calculate the actual mass of an moving object ? which is always moving from the creation of the universe
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This is a good question, and also a good reminder to be careful with one’s language when writing about physics!
This is a good question, and also a good reminder to be careful with one’s language when writing about physics!Most of the time, if you’re reading an article, what we mean by mass and rest mass is exactly the same. Rest mass is a slightly more precise term in its phrasing, meaning specifically the mass of that object when it is at rest, relative to the person measuring its mass. This is almost always how we measure mass. If you’re in a lab (or a kitchen), and you measure an object’s weight on a scale, that object is not moving at any speed. If it is moving at a speed, you should probably catch it, because it’s rolling off your scale.