<prompt> What is the force on a 1 kg mass due to the gravitational force?  <response>: The force on a 1 kg mass due to gravity is approximately 9.8 Newtons. This is calculated using the formula F mg, where F is the force, m is the mass, and g is the acceleration due to gravity. The approximate value of g on the surface of Earth is 9.8 ms2. Therefore, the force on a 1 kg mass due to gravity is 1 kg 9.8 ms2 9.8 N. 