What is the relationship between energy, work, and machines?

First, let’s cover some definitions. Energy is power derived from the utilization of physical or chemical resources. Work is done when a force is exerted on an object and moves the object. Work is calculated my multiplying force and distance. Doing work always means transferring energy. The energy may be transferred to the object to which you apply the force or it may go elsewhere. The work-energy theory states that the work done by a system equals the change in kinetic energy of that system. Every process that is done by machines can be simplified in terms of work. For a machine to function, work or energy needs to be put into the machine; this is called work input. Work output is the energy that comes out of the machine. The output work done by a simple machine can never exceed the input work done on the machine.