Complete the last column then answer the following questions

Data Table: M m aexp HK Run total block mass total hanging acceleration coefficient of kg mass (kg) (m/s2) friction Run #1 - 0918 Rg . 02 7 Kg . 03 85 m /s Run #2 .0918 Kg 0 027 Kg . 0234 m /s' Run #3 . 1918kg . 055 Kg . 254 m /s Run #4 . 1918 kg . 2 27 Kg . 084 m /5 - Run #5 .0902kg . 025 Kg . 008m 's Run #6 .0 902 kg .025 Kg . 00 2 m /s 2 Run #7 . 0902 kg . 035 kg . 876 m 15 Run #8 . 0902kg . 045 Kg . 516 mls ? Run #9 . 0902 Kg 1. 055 kg . 911 m/s ? Summary: Run # Part and Description uk 1 A, Largest smooth side of block 2 A, Largest smooth side of block 3 B, Larger mass of block 4 C, Smallest smooth side of block 5 D, Largest rough side of block 6 D, Smallest rough side of block 7 E, Larger hanging mass 1 8 E, Larger hanging mass 2 9 E, Larger hanging mass 3 Questions 1. How does the coefficient of kinetic friction vary with the mass of the block? 2. How does the coefficient of kinetic friction vary with the area of contact between the block and the horizontal surface