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				   when is mass negetive?



6 years ago

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### Answers : (1)

										Dear Edison,

The idea of a negative mass is conjectural, since no material object has  ever been found that can be shown by experiment to have a negative  mass. In considering hypothetical particles with  negative mass, it is important to consider which of these concepts of  mass are negative; however, in most analyses of negative mass, it is  assumed that the equivalence principle and conservation of momentum  continue to apply. The Einstein equivalence principle postulates that   inertial mass must equal passive gravitational mass; while the law of conservation   of momentum requires that active and passive gravitational mass  must be identical.

If one were to treat inertial mass mi,  passive gravitational mass mp,  and active gravitational mass ma distinctly, then Newton's law of universal  gravitation would take the form
$m_ia=-G\frac{m_pm_a}{r^2}$
Thus objects with negative gravitational mass (both passive and  active), but with positive inertial mass, would be expected to be  repelled by positive active masses, and attracted to negative active  masses.

Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best!!!Regards,Askiitians ExpertsHimanshu Geed

6 years ago

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