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Science project idea on how friction may be reduced.
Friction Science Project Idea
How friction may be reduced. Friction Science Experiment I  By means of a spring balance, pull an iron block up an inclined plane. Note the pounds of force necessary. Now put grease or heavy oil on the plane and on the lower side of the block. Note again the force necessary to pull the block up the plane. Conclusion?
Give examples of the use of oil or grease in machines with which you are familiar. Explain why failure to oil the working parts of a machine will cause them to wear out more rapidly; why screws may be screwed into wood more easily if soap is rubbed on them; why failure of the oil supply of an automobile engine causes the engine to become
overheated; why the wheel on a wagon or automobile will sometimes refuse to turn if it has not been properly oiled. (Note that metal expands when heated.)
Friction Science Experiment II By means of a spring balance pull a small box filled with weights or sand up an inclined plane. Note the force required. Now put rollers under the box and again pull it up the same incline. Note the force required. Can you skate faster with roller skates fitted with ball bearings or with those which have plain bearings? Is it easier to slide a barrel along on its end or to roll it? All automobile and bicycle wheels have roller or ball bearings. What is your conclusion concerning the friction between surfaces in which one rolls upon the other as compared with the friction between surfaces that slide upon one another? Name all the cases you know where the efficiency of machines is increased by the substitution of rolling friction for sliding friction. Bearings are usually made of different material from that of the axles that rest upon them. This is done because generally the friction between two surfaces of different material is less than that between surfaces of the same material.
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