Question

if the rotational motion of earth increases, then the weight of the body-

• A. will remain same
• B. will increase
• C. will decrease
• D. none of these

Answer 1

The correct option is C will decrease

If the earth's rotation speed increases then weight of the body decreases, This is because when we see a moving body on the rotating earth's surface itself is in reference frame, So when earth rotates centripetal force acts towards center of rotation. Also to keep rotation intact an equal and opposite centrifugal force acts on rotating earth.

So, if weight of body $=mg$

Then under the effect of increased rotational speed of earth equation becomes ${mg}^1=mg-$ centrifugal force.

Where $g^1$ is decreased value of acceleration.