The key difference between Newton and joule is that Newton is a unit that measures force while Joule is a unit that measures energy. The joule symbol J is a derived unit of energy work or amount of heat in the International System of Units. Named for English physicist James Prescott Joule the joule J is one of the cornerstone units of the International metric system.
A joule ˈdʒaʊl or sometimes ˈdʒuːl is a unit in the SI system.
Alternatively it is the amount of work done on an object when a force of one newton acts in the direction of the objects motion over a distance of one meter 1 joule equal 1 newton meter or Nm. Equal to the work done or energy transferred by a force of one newton acting over one meter in the direction of the force. The joule is used as a unit of work energy and heat and is widely used in scientific applications. Named in honour of the English physicist James Prescott Joule it equals 10 7 ergs or approximately 07377 foot-pounds.