In almost every situation there is a machine to help facilitate the task. The machines most common among the simplest. There are a wide range of machines. The mechanical device that allows all sorts of human activities including machines that convert energy from one form to another, such as car fuel, chemical energy stored in the change of power stroke fuel . Machine word is also used for things as information processing, such as television and computer. A simple machine is something very positive. It is a device that can carry energy from one place to another, change direction or change its strength. The opening allows out a song is just a machine. Another simple machine is a screw: its action is clearly visible to the jack, which change the energy of people working on the crank enough power to lift the car.
Similarly, screws are driven into the wood by the weak force of fingers turning a screwdriver. Simple machines that multiply the force have one thing in common: if they are the work of the force must be moved farther than the load is moved. The hand pressing the presser foot moves about 10 minutes to the corner of the slab is raised. The hand grip on Jack moves a long way (because it makes many turns) to increase the working of simple machines. They convert a small force, the effort exerted on the long, applied over a shorter distance. In fact, the work done by the operator of a machine (time effort on the distance traveled by the effort) is equal to work done on the object (load times the distance traveled by the load) .