ACT Science Practice Question #1793 (Hard (590)) | Test Citadel
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ACT Science Difficulty: Hard (590)

Digital ACT Science Practice Question #1793

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Why is the coefficient of static friction generally higher than the coefficient of kinetic friction? 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
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Stationary asperities interlock more deeply than moving ones.

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Stationary contact allows microscopic asperities to deform and interlock, requiring higher initial breakaway force....

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