Frictions

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CUNY College of Staten Island *

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Course

PHY-116

Subject

Mechanical Engineering

Date

Jan 9, 2024

Type

xlsx

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6

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Your name: Lab partner name: Date: Table1 Measurment for friction coefficient 0.1955 1.9179 2.204 0.967 1.149 0.504 0.2955 2.8989 2.855 1.698 0.985 0.586 0.3955 3.8799 3.668 2.16 0.945 0.557 0.4955 4.8609 4.551 3.139 0.936 0.646 0.5955 5.8419 5.528 2.84 0.946 0.486 0.6955 6.8229 6.938 3.588 1.017 0.526 Mass of the cart = Normal force =B9*9.81 Static friction coefficient =D9/C9 Kinetic friction coefficient =E9/C9 Mass of cart [ g ] Normal force [ ] Static friction force [ ] Kinetic friction force [ ] Static friction coefficient Kinetic friction coefficient Start with the cart+100g added, and then repeat with increasing 100 grams at a time 0.000 1.000 2.000 3.000 4.000 5.000 6.000 f(x) = 0.543868520932041 x R² = 0.989888738332358 f(x) = 1.19450867805315 x R² = 0.993896378231008 Fricton force [ N ]
Figure 2 Friction force vs normal force Table 2 Analysis of friction coefficient Method PD 0.996 0.011724 0.9939 0.551 1.2508503 0.5439 Static calculated avg =AVERAGE(F9:F14) Static from graph is the slope of the graph. Look the equation on the graph s Kinetic calculated avg =AVERAGE(G9:G14) ` Kinetic from graph is the slope of the graph. Look the equation on the graph PD for static =ABS(C42-C43)/((C42+C43)/2)*100 PD for kinetic =ABS(C44-C45)/((C44+C45)/2)*100 Table 3 Object freely moving on inclined plane Friction coefficient Static calculated average Static from graph Kinetic calculated average Kinetic from graph 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 0.000 Normal force [ N ]
0.1955 28.70 0.55 0.55 0.2955 29.60 0.57 0.4955 31.80 0.55 Start with the cart with no mass added, and then repeat with adding 100 gr Static friction coefficient from angle =TAN(RADIANS(C61)) Average static friction =AVERAGE(D61:D63) Post lab Questions Q1: Which coefficient, static, or kinetic is usually the larger? Q2: Is it possible to have a coefficient of friction greater than 1? Justify your answer. Mass of the cart Angle when motion starts Static friction coefficient from angle Average static friction coefficient The coefficient of statc fricton tends to be greater than the coefficient of kinetc fricton when considering a specific combinaton of surfaces. Yes, it's possible to have a coefficient of fricton greater than 1, indicatng that the force needed to overcome fricton is higher than the force pressing the surfaces together, possibly due to surface irregularites or other factors enhancing fricton.
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List of eqipment Cart Slotted masses Friction board Force sensor Balance Figure 1 Experiment setup for firction
sheet. h sheet.
rams at a time
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