Science project idea on reasons for using machines.
Using Machines Science Project Idea 
Reasons for using machines. A device by which forces are advantageously applied to accomplish work desired is called a machine. Name the machines with which you are most familiar, and state the purpose of each. Explain, as far as possible, how the invention of these machines has resulted in the accomplishment of a greater amount of, or more satisfactory, work. The chief advantages gained in the use of machines may be made clear by a few simple examples. (a) What is the advantage of a claw hammer in pulling out a nail? Can you exert sufficient force with the fingers to pull the nail? Give other examples showing that by use of a machine greater force may be exerted at a particular point. 
(b) What are the advantages gained in the use of a sewing machine? Why does a country doctor use an automobile instead of a horse and buggy as formerly? Give other examples showing how speed is gained by the use of machines. (c) What is the advantage of using a single fixed pulley, as in raising a flag to the top of a flagpole? Give other examples in which an advantage is gained by changing the direction of the force.
Complex machines Most machines, such as a sewing machine, typewriter, clock, automobile, or threshing machine, are so complex that, at first sight, to gain an understanding of their mechanism seems almost an endless task. It will be found, however, that each of these machines is a combination of a large number of simple machines which can easily be understood. These simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
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