The hypothesis that a body’s inertial mass results from its interaction with the rest of the matter in the universe.
- According to Mach, the slopping of your drink in the lurching aeroplane is attributable to the influence of all the matter in the Universe-an idea that became known as Mach's principle.
- Working with his graduate student Carl Brans, Dicke incorporated Mach's principle into an alternate theory of gravity by adding an extra term to Einstein's equations.
- Sciama was very keen on Mach's principle, the idea that objects owe their inertia to the influence of all the other matter in the universe.
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