Digital ACT Science Practice Question #1792

The coefficient of static friction (mu_s = F_static / F_normal) for this wood-on-steel interface is: Experiment Context (Static and Kinetic Friction of Wooden Blocks): Physics students placed a 2.0 kg wooden block on a horizontal steel bench. A motorized force gauge gradually increased pulling force until the block slipped, then recorded force during steady motion at 0.5 m/s. Tests were repeated with added weights: Table 13: - Normal Force = 19.6 N (0 kg added): Peak Static Force = 9.8 N; Kinetic Pulling Force = 5.9 N - Normal Force = 39.2 N (2 kg added): Peak Static Force = 19.6 N; Kinetic Pulling Force = 11.8 N - Normal Force = 58.8 N (4 kg added): Peak Static Force = 29.4 N; Kinetic Pulling Force = 17.6 N - Normal Force = 78.4 N (6 kg added): Peak Static Force = 39.2 N; Kinetic Pulling Force = 23.5 N