+Work

The unit of work or energy is the joule (J) where one joule is one newton

metre. The joule is defined as the work done or energy transferred when

a force of one newton is exerted through a distance of one metre in the

direction of the force. Thus

where  F is the force in newtons and s is the distance in metres moved

by the body in the direction of the force. Energy is the capacity for

doing work.