Work consists of two parts. The other is the distance over which the force is applied. Force X Distance. Work is measured in joules. Force is the pull or the push on an object, resulting in its movement.
Force is measured in newtons.
Distance is the space the object moves. It is measured in metres. When we say a machine makes it easier for us to do work, we mean that it requires less force to accomplish the same amount of work. Apart from allowing us to increase the distance over which we apply the smaller force, machines may also allow us to change the direction of an applied force. For example, a machine has a mechanical advantage of 5 if an applied force of 1 kg can counterbalance a weight of 5 kg.