Gravitational forces that make things fall down to the ground – unless another force stops them. An apple falling from a tree falls straight down. A ball thrown up, comes back down. And so do we ...

k{g^{- 2}}\). Overall this equation is simpler than it looks as long as you ensure that: distance is given between centres units are all in metres and kilograms The force of gravity exists between ...

The work of Lämmerzahl and Ulbricht could thus serve as a basis for realizing mechanical units such as the kilo on the basis of gravitational force. More information: Claus Lämmerzahl et al ...

In 2018, scientists redefined the kilogram related to the basic electromagnetic principles ... units could now be defined in terms of gravitational force instead of just an electrical one.