There are different situations on which a variety of problems can be
There may be some situations in which it is asked to hypothetically change the dimensions, mass or rotational period (duration of the day) of Earth and the problem is asked on analyzing the effect on
Some situations are given below with example videos for an understanding of applications.
Effect of change in radius of Earth: https://youtu.be/tI656M_LacQ
Weightlessness at Equator of Earth: https://youtu.be/YLcoqCjqIFE
Half Weight compared to Earth Surface: https://youtu.be/xhDaXFfazeE
Oscillating Pendulum on another Planet: https://youtu.be/12fAUACg_F4