Differences And Force Of Bynamic Possibility And Force Of Static Frictivity

1187 Words 5 Pages
Problem:
Is there a relationship between the mass of an object and the force of static friction and force of kinetic friction of that object? If so, what type of relationship is there?

Background:
Friction is a type of force that is created when two surfaces move across one another. Static friction is friction between two or more solid objects that are not moving relative to one another. Kinetic friction is the amount of friction between two objects that are moving relative to each other. All of these types can be determined by the “FUN” equation (f = μn) if you know the coefficient of each type and the normal force.

Mass may influence friction by also influencing a dependent relationship towards friction and the normal force.
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It was increasing at almost a constant rate, as seen in Figures 4, 5 and 6.

Block Mass (g) Trial 1 (N) Trial 2 (N) Trial 3 (N) Trial 4 (N) Trial 5 (N) Average Force (Static Friction, N)
304.6 0.634 0.619 0.630 0.554 0.632 0.614
404.6 0.937 0.866 0.766 0.835 0.820 0.845
504.6 1.023 0.969 1.043 1.078 1.093 1.041
604.6 1.191 1.263 1.410 1.319 1.319 1.300
704.6 1.489 1.241 1.652 1.434 1.478 1.459
804.6 1.762 1.757 1.723 1.726 1.770 1.726

Block Mass (g) Trial 1 (N) Trial 2 (N) Trial 3 (N) Trial 4 (N) Trial 5 (N) Average Force (Kinetic Friction, N)
304.6 0.473 0.464 0.467 0.450 0.465 0.464
404.6 0.593 0.603 0.598 0.613 0.625 0.606
504.6 0.753 0.751 0.751 0.750 0.787 0.758
604.6 0.902 0.897 0.894 0.903 0.912 0.902
704.6 1.068 1.060 1.068 1.076 1.072 1.069
804.6 1.208 1.203 1.181 1.144 1.168 1.175

Calculations Normal Force/Weight F_W= mg F_W=(0.3046g)(9.81m/s^2 ) F_W=2.0988126 N= 2.10 N

Average Force
F_AVG=(Trials 1 to 5)/5
F_AVG=(0.473N+0.464N+0.467N+0.450N+0.465N)/5
F_AVG=0.4638 N=0.464 N

Coefficient of Friction (Kinetic and Static) f=μn → μ=f/n
μ=(0.4638N/2.0988126N)
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By using the method we chose, it created a way for us to isolate the dependent and independent variables and showing the effect they had on one another. However, there are some points of error that should be addressed to see if it affected the validity of the experiment. When performing our experiment, I was the one who pulled the block across the plank. I may not have been pulling the block with as little force as possible or not with a true constant force. This may have caused an artificial increase in the static friction force, as well as not get a perfect average for the kinetic friction. Other sources of error may have affected our numbers as well. There may have been environmental factors such as a draft in the room that could have artificially decreased the data numbers by causing air resistance on the wooden block. Also, the Force Sensor was not calibrated at a definite zero every time we went back and zeroed it. This could have caused an increase or a decrease in the data numbers. These aside, our data can still be trusted to be as accurate as

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