{"id":820,"date":"2023-01-14T04:54:49","date_gmt":"2023-01-14T04:54:49","guid":{"rendered":"https:\/\/qpr.ca\/blogs\/physics\/?p=820"},"modified":"2023-01-14T04:56:03","modified_gmt":"2023-01-14T04:56:03","slug":"1002-alan-coopers-answer-to-according-to-special-relativity-the-mass-of-an-object-is-dependent-on-its-velocity-does-this-mean-that-there-is-an-absolute-zero-velocity-in-the-universe-and-we-can-m","status":"publish","type":"post","link":"https:\/\/qpr.ca\/blogs\/physics\/2023\/01\/14\/1002-alan-coopers-answer-to-according-to-special-relativity-the-mass-of-an-object-is-dependent-on-its-velocity-does-this-mean-that-there-is-an-absolute-zero-velocity-in-the-universe-and-we-can-m\/","title":{"rendered":"Mass in Special Relativity"},"content":{"rendered":"

Source: (1002) Alan Cooper’s answer to According to special relativity, the mass of an object is dependent on its velocity. Does this mean that there is an absolute zero velocity in the universe and we can measure it? – Quora<\/a><\/em><\/p>\n

The claim that \u201cAccording to special relativity, the mass of an object is dependent on its velocity\u201d is false. In fact it\u2019s worse than false; it\u2019s meaningless – because the velocity of an object is not something that exists except as relative to some observer.<\/p>\n

What is true is that something which used to be called the \u201capparent mass\u201d, or \u201crelativistic mass\u201d, of a body as seen by an observer is dependent on the velocity of the observer relative to the object (or of the object relative to the observer). However neither this apparent mass nor the velocity are properties of the object, since they depend also on its relationship to the observer.<\/p>\n

In terms of any particular object and observer, there is indeed an absolute zero relative<\/b> velocity. It corresponds to the situation where neither of them sees any change in the distance or direction of the other, and is absolute in the sense that any other inertial observer will perceive them as having the same velocity as one another (relative to it) and so as having zero relative velocity (relative to one another).<\/p>\n

And the \u201capparent mass\u201d as perceived by an observer at zero relative velocity, which is<\/b> an inherent property of the object, is what was once called the \u201crest mass\u201d but has for many decades been identified just as the mass of the object (without any qualifier).<\/p>\n","protected":false},"excerpt":{"rendered":"

Source: (1002) Alan Cooper’s answer to According to special relativity, the mass of an object is dependent on its velocity. Does this mean that there is an absolute zero velocity in the universe and we can measure it? – Quora The claim that \u201cAccording to special relativity, the mass of an object is dependent on … Continue reading Mass in Special Relativity<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"topics":[],"class_list":["post-820","post","type-post","status-publish","format-standard","hentry","category-all"],"_links":{"self":[{"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/posts\/820","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/comments?post=820"}],"version-history":[{"count":2,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/posts\/820\/revisions"}],"predecessor-version":[{"id":823,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/posts\/820\/revisions\/823"}],"wp:attachment":[{"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/media?parent=820"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/categories?post=820"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/tags?post=820"},{"taxonomy":"topics","embeddable":true,"href":"https:\/\/qpr.ca\/blogs\/physics\/wp-json\/wp\/v2\/topics?post=820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}