Physics Laboratory Experiment on Friction
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Physics Laboratory Experiment on Friction

Friction is a force that opposes the sliding or rolling of one body over another. It can work for us and against us. Without friction, you would slip and fall. Friction makes cars stop too. It exists in machines where a lot of moving parts against each other. Even in simple machines, there are always some friction. A pulley rubs on its axle, wheels rub against chains, belts and other wheels.
Theory: Work is done only when a force succeeds in moving an object. But we know that for every force expected on an object, another force over (friction) will always resist it. Input work simply refers to the work done on the machine. Output work refers to the useful work that the machine does. Not all of the input work that goes into the machine is converted to output work. A position is used to overcome friction. Friction increases the work necessary to operate machinery, it causes wear and tear of parts that rub against each other, and it generates heat, which often does additional damages to the machines. Since a certain amount of input work is used against friction in machines, then output work will always be less than the input work. Scientists express efficiency in terms of input and output work that is, Efficiency = Output work/Input Work. OBJECTIVE: To investigate how the kind of surface and weight of an object affect friction. MATERIALS: Wooden board (25 cm long and 15 cm wide), Sandpaper, Thumbtacks, Metal paper clip, Metal Washers or set of weights, paper box, spring scales. PROCEDURE: 1) To half of the wooden board tack the sandpaper. Make sure the paper lies as flat as possible. See figure provided by your professor. 2) Push a paper clip into the box and shape the free end like a hook. Mark the starting line on the board. Always put the paper box in front of the starting line before beginning on any activity. 3)Attach the spring scale to the paper box by putting its ring into the paper box hook. 4) Pull the scale slowly and steadily across the smooth surface of the board. Maintain a uniform speed across the board. 5) Put the paper box over the sandpaper. Pull it slowly and steadily across the sandpaper. 6) Put the weights and pull the paper box across a smooth as well as on a rough surface. Do the same with the addition of weights. See figure provided by your professor. Record your results in the table provided. QUESTIONS/PROBLEMS 1) Is friction greater on a smooth or rough surface? Why? 2) Enumerate three (3)ways to minimize friction. 3) Engineers have been trying to minimize, if not entirely eliminate friction in machines. Yet friction is often times necessary. Give five (5) examples where frictional force is needed. 4) A cadet tries to close his bag with a zipper whose teeth has been roughened a little with rust. How would you reduce friction in this situation? 5) Why is it that output work is always lesser than input work? 6) Is is right to say that whenever a body is in motion, there is friction? 7) What force is required to pull an iron box weighing 80.3N across a concrete floor? (Coefficient of friction of iron = 0.30). 8) Give two (2) desirable effects and three (3) undesirable effects of friction. Prepared by: Jessie R. Agudo, B.S.Civil Engg'./Master of Arts in Teaching Mathematics (M.A.T. MATH)

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