Q:  What is the surface gravity of Earth?

          g  =  9.81 m/s^2


  Q:  What is the surface gravity of Mars?

          g  =  3.70 m/s^2


  Q:  How would it feel to walk on the surface of Mars?

          Refreshingly easy!  A person who weighs 150 pounds
          on the Earth would weigh only about 57 pounds on
          Mars.  It would be easy to jump high and far.  I might
          even be able to dunk a basketball.