105_friction_report_f23

PHYS 105L: Experiment 7 Friction Report Submitted By: Morgan Fite and Brooke McGuire Lab Partner (if submitting separate reports): Use this document as your report template. Copy and paste graphs and tables into this document in the indicated places. Type your answers to discussion questions under the question. Save the document to the desktop and on your flash drive. Be sure to save often. I. Tabulated data and calculated results – 30 points Part 1 Effect of Acceleration on Coefficient of Kinetic Friction: Graph Part 1, Part 2, Part 3: Data Table Part 1 Part 2 Part 3 bar mass 0.4966kg 0.4966kg 0.4966kg 0.4966kg 0.4966g block mass 0.1305kg 0.1305kg 0.1305kg 0.1305kg 0.1305kg m1 0.6271kg 0.6271kg 0.6271kg 0.6271kg 0.6271kg m2 0.170kg 0.190kg 0.210kg 0.170kg 0.210kg a1 0.2735 0.3134 0.4956 0.316 0.4421 a2 0.163 0.3131 0.4789 0.2881 0.328 a3 0.357 0.3139 0.5238 0.3325 0.588 a avg 0.2645 0.3135 0.499433333 0.3122 0.4527 st dev 0.09731 0.0004 0.022694126 0.022442593 0.130323712 Score Part I _____(30) Part II _____(5) Part III

Fg f 0.2298N 0.4054N 0.6097N 0.2713N 0.5527N m k 6.146 0.06597 0.09921 0.04415 0.0899 Large Surface Area X X X 0.0065 m^2 X Small Surface Area X X X 0.00325 m^2 X II. Calculations – 5 points (Show formulas and calculations written out with units on all values.) Part 1 Effect of Acceleration on Coefficient of Kinetic Friction 1. Calculation of kinetic frictional force (F fk ). (3 points) 2. Calculation of coefficient of kinetic friction ( m k ). (2 points) III. Discussion/Analysis – 15 points - Remember, answers must be right below the question. 1. Draw a free-body diagram of the block if the string is not parallel to the track. Using your figure, explain why the string must be parallel to the track in this experiment and what happens if it is not. Draw your diagrams below . Your explanation must be typed . (3 points) . · The string must be parallel to the tack because if not then the tension would not be the same as the hanging mass. And they would not be the same system. T