Fundamental Problem 8.7 Part A Blocks A, B, and C have weights of 57 N,25 N, and
ID: 1774474 • Letter: F
Question
Fundamental Problem 8.7 Part A Blocks A, B, and C have weights of 57 N,25 N, and 20 Determine the smallest horizontal force P that will cause impending motion. The coefficient of static friction between A and Bis ' = 0.3 between Band C, , = 0.4, and between block C and the ground, -035 Express your answer to three significant figures and include the appropriate units. N, respectively. Fiqure 1) P:60.8N Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Provide Feedback Continue Figure 1 of!Explanation / Answer
The problem can be solved as follows -
Friction between A and B:
57 * 0.3 = 17.1 N
Friction between B and C:
(57 + 25) * 0.4 = 32.8 N
Friction between C and ground:
(57 + 25 + 20) * 0.35 = 35.7 N
The friction between B and C is less than the friction between C and ground, so the smallest horizontal force that will cause impending motion is:
F = 32.8 + 17.1 = 49.9 N.
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