100%(24)24 out of 24 people found this document helpful
This preview shows page 3 - 6 out of 6 pages.
QUESTION 3 Study the results from Table 1 and Table 2. What can you conclude about these results?QUESTION 4Using the data from the same tables, do you think that the ratio of μkto μsis constant in both cases? If so, what do you think this indicates?QUESTION 5Studying the standard deviation data from all the 4 tables, which experiment do you thinkis the most reproducible? Why?QUESTION 6In general, how does the coefficient of static friction compare to the coefficient of dynamic friction?
QUESTION 7In designing machinery, would we prefer to use materials with larger or smaller coefficient of friction? Explain your reasoning.QUESTION 8In driving a vehicle, would you prefer to use materials for the contact between the wheelsand the road with larger or smaller coefficient of friction? Explain your reasoning.IV.RESULTSThe initial wooden block used for this experiment was too light and needed additional weight to provide more accurate data. The total mass used for my experiment was 0.42kgand the Force (N) was calculated to be 4.11N. This initial data was used to calculate the force static friction (Fs) and force kinetic friction (Fk). Furthermore, force static and kinetic friction data was used to determine the coefficient of static friction and coefficient of kinetic friction.TABLE 1: Wood / Wood (larger surface block)Force StaticFriction (Fs)Force KineticFriction (Fk)Co-eff. StaticFrictionssNFFCo-eff. KineticFrictionkkNFFTrail 11.29N0.88N0.310.21Trail 21.4N0.9N0.340.22Trail 31.38N0.9N0.340.22Trail 41.39N0.87N0.340.21Trail 51.38N0.85N0.340.21Average1.37N0.88N0.330.21Standard Deviation0.044380.021210.13420.00548TABLE 2: Wood / Wood (smaller surface/sideways block)Force StaticFriction (Fs)Force KineticFriction (Fk)Co-eff. StaticFrictionCo-eff. KineticFriction