<P> The gravity of Mars is a natural phenomenon by which all things with mass around Mars are brought towards it . It is weaker than Earth's gravity owing to the planet's smaller mass . The average gravitational acceleration on Mars is 3.72076 ms (about 38% of that of Earth) and it varies laterally . In general, topography - controlled isostasy drives the short wavelength free - air gravity anomalies . At the same time, convective flow and finite strength of the mantle lead to long - wavelength planetary - scale free - air gravity anomalies over the entire planet . Variation in crustal thickness, magmatic and volcanic activities, impact - induced Moho - uplift, seasonal variation of polar ice caps, atmospheric mass variation and variation of porosity of the crust could also correlate to the lateral variations . Over the years models consisting of an increasing but limited number of spherical harmonics have been produced . Maps produced have included free - air gravity anomaly, Bouguer gravity anomaly, and crustal thickness . In some areas of Mars there is a correlation between gravity anomalies and topography . Given the known topography, higher resolution gravity field can be inferred . Tidal deformation of Mars by the Sun or Phobos can be measured by its gravity . This reveals how stiff the interior is, and shows that the core is partially liquid . The study of surface gravity of Mars can therefore yield information about different features and provide beneficial information for future landing projects . </P> <P> To understand the gravity of Mars, its gravitational field strength g and gravitational potential U are often measured . Simply, if Mars is assumed to be a static perfectly spherical body of radius R, provided that there is only one satellite revolving around Mars in a circular orbit and such gravitation interaction is the only force acting in the system, the equation would be, </P>

What is the force of gravity on earth and mars
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