+Force

The unit of force is the newton (N) where one newton is one kilogram

metre per second squared. The newton is defined as the force which, when

applied to a mass of one kilogram, gives it an acceleration of one metre

per second squared. Thus,
  

where m is the mass in kilograms and a is the acceleration in metres

per second squared. Gravitational force, or weight, is mg, where
g = 9.81 m/s2