III. Data Tables & Calculations: Data Table - Part 1 - Horizontal Ramp: Data Table - Part 1 mass of wood block=335 total cargo mass mass kg 13.45 3.55 13.65 Normal force kg 0.100 0.200 0.300 0.400 0.500 3.85 0.600 3.95 best linear fit slope, U₁= N 33.81 34.49 Lab05- Coefficient of Friction kg 1 150 35.५५ 157) 200 37.73 200 2 38.4240 130 150 200 240 critical hanging trial # 3 120 130 200 240 mass kg 4 120 5 120) 130 150 1800 гип 740 f max = avg avg hanging hanging mass force N kg 12 134 0176 2.352 X9.8 K9=X=1000 X. 9.X NF Calculations - Part 1 - Horizontal Ramp: 1. Record the mass of the wood block. Add its mass to the specified cargo masses in the 1st column to get the total mass on the ramp that is recorded in the 2nd column. Using MKS units, multiply by g to convert this total mass on the ramp into the Normal force, N, & record in the 3rd column. 1.47 24 2. For each specified added cargo mass, gradually increase the hanging mass until the block just slips & continues to move "slowly" across the ramp. A mm/sec is too slow, a cm/sec is too fast. Record this critical hanging mass for 5 trials for each of the 6 block set-ups. For each new trial, remove part of the hanging mass, then gradually add it back onto the hanger until it once again starts sliding. oluaut 3. Compute the average critical hanging mass for each set of 5 trials & record in the next to last column. Using MKS units, multiply by g to convert this average critical hanging mass into the average hanging force (which is equal to the maximum friction, fax), & record in the last column. 4. Plot the average fmax data along the vertical & the Normal force, N, along the horizontal. Execute a "Best-Line Fit" on this plot with "Trendline" & record the slope in Data Table 1 as the "best linear fit slope, μ = ", (you might want to look up "Lineest" or "Slope"). This is the average value of the coefficient of friction for Part 1. Show results on the graph & in the data table. Lightly drumming the table top with your fingers can help produce results that are more consistent. Alternatively, you get the harmonic driver motor out from the vibrating strings experiment (Lab 17) & attach it to the lab bench with a table clamp. Plugging it in will provide a continuous & constant background vibration. These vibrations seem to help with breaking loose the wood block when it has gotten stuck on some small patch of goo, probably finger print oils from long ago.