<Dl> <Dd> g (r) = − G m 1 r 2 r ^ (\ displaystyle \ mathbf (g) (\ mathbf (r)) = - G (m_ (1) \ over ((\ vert \ mathbf (r) \ vert) ^ (2))) \, \ mathbf (\ hat (r))) </Dd> </Dl> <Dd> g (r) = − G m 1 r 2 r ^ (\ displaystyle \ mathbf (g) (\ mathbf (r)) = - G (m_ (1) \ over ((\ vert \ mathbf (r) \ vert) ^ (2))) \, \ mathbf (\ hat (r))) </Dd> <P> so that we can write: </P> <Dl> <Dd> F (r) = m g (r). (\ displaystyle \ mathbf (F) (\ mathbf (r)) = m \ mathbf (g) (\ mathbf (r)).) </Dd> </Dl>

State the law of universal gravitation and use examples to explain how changes in mass