When an object is rotating on an axis, it has stored rotational energy in it. Since energy and mass are related, does this stored rotation increase the mass of the object? And if so, will it be harder to move the rotating object in a linear direction than when it is not rotating? Does the rotating object have more inertia? Is there more force required when you push in a linear direction to make it go to the same speed as with a non-rotating object? With pushing and linear direction I mean causing a translational motion. And furthermore, does the rotating object have a stronger gravitational pull?

Thanks for reading.


If the object is spinning close to the speed of light then it has significantly more energy than if it were at rest. This does contribute to an increase in gravitational pull and is significant in astrophysical phenomena like neutron stars!


The Earth is also more massive because its spinning but we have no hope of detecting the slight difference due to this effect.

  • $\begingroup$ Thanks, but without reading that paper, will the object that's spinning have more inertia too? And therefore be harder to push? $\endgroup$
    – Arundel
    Sep 15 '15 at 18:54
  • 1
    $\begingroup$ Yes it will be harder to push. $\endgroup$ Sep 15 '15 at 19:33

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.