The gravity on Moon is about 1/6 of the gravity on Earth.  If a person weights 120 lb on Earth,   His weight on Earth, in unit of Newton, is:                      (Hint: 1 lb = 4.45 N)                      0 N                           27 N                     c.    89 N                     d.   534 N        His mass on Earth is:  (Hint: Weight = mass×9.81 m/s2   or             mass = Weight ÷ 9.81 m/s2) 265 kg                     54 kg                     c.   9.1 kg                    d.   0 kg            How much does he weigh on Moon?                                                                                      720 lb                     120 lb                    c.    20 lb                     d.   0 lb   His mass on Moon is: 265 kg    54 kg                     c.  9.1 kg                     d.   0 kg

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!