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2019

# Coefficients of Friction Lab – NO PLAGIARISM

Coefficients of Friction LabObjective: You want to measure the friction of different materials as they rub against each other. You will use the spring scale in the kit (or some equivalent spring scale) to do this.
Take the spring scale and hook an object (like a piece of cloth) to it that you can drag along a surface (like the floor). Use whatever you need to (tape, string, staples, glue) in order to attach the spring scale to the object, but leave the surface that will get dragged along the floor so that these other things (tape, glue, etc) don’t rub against the floor. You will choose another pair of materials later, and they should have significantly different slipperiness to them.1. Note down the two materials that will be rubbing against each other (such as “cloth and rug” or “ceramic tile and wood” or “paper and pine needles”).
2. Note down the weight of the object that you are dragging (you can add some weight on top if the material you are dragging is exceptionally light). You can use the spring scale to do this, or some other scale you might have access to.
Now find the maximum static friction between the two objects. Pull horizontally on the spring scale, very gradually harder and harder.3. Note down the number you get just before the object starts to move (probably the highest number it reaches).
4. Now pull the object a little harder than so that it maintains a moderate constant velocity. Note down the reading on the scale as you are pulling it.
Now you are going to find the maximum coefficient of static friction due to rubbing the two materials together.5. Divide the force exerted before moving (#3) by the weight (#2). (your answer will have no units, as they will cancel)
6. Now find the coefficient of kinetic friction. Divide the force exerted while moving (#4) by the weight (#2). (this answer will also have no units)
7. Which is larger, the coefficient of static friction or the coefficient of kinetic friction?
Repeat this process 3 times, each time changing the mass of the thing you are pulling. Each time, note down (as before):a. The weight being pulled
b. The force just before the object starts to move
c. The force as the object moves at a moderate constant velocity
Graph the force of friction vs the weight being pulled for both the static and kinetic friction. Find a linear trendline, and see what its slope is.Does a linear trendline seem to fit this data?
Does your slope match the coefficients of friction you found earlier?
Now choose two materials that are of different slipperiness than the two you had before. Go ahead and repeat the process. Note down:a. What the two materials are
b. The weight being pulled
c. The force just before the object starts to move
d. The force as the object moves at a moderate constant velocity
e. Calculate the coefficient of static friction
f. Now calculate the coefficient of kinetic friction.
Based on the coefficients of friction that you got, does a higher or lower coefficient of friction denote a more slippery interface between the materials?
In 4-5 sentences, summarize your findings from this lab.

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