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Q1%20Phys131-E2%20%282nd%20law%29

# Q1%20Phys131-E2%20%282nd%20law%29 - forces C[5 pts What is...

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Name ___________________________________ Student ID ____________ Score _______ last first Physics 131, WI 2009 Exam 2 Q1 Phys131-E2 (2nd law).doc I. Blocks, Strings, and Pulleys [20 pts] Blocks with masses of m 1 = 1.0 kg and m 2 = 2.0 kg are connected by a string, supported on a frictionless table, and connected by a string and pulley to a hanging block with a mass m 3 = 3.0 kg, as shown, and released from rest. A. [3 pts] In the space below draw a free-body-diagram for each of the blocks and label force accordingly. Identify the third law pairs on your diagram by connecting the two forces by a dash line. B. [3 pts] Write Newton second law for each of the blocks 1, 2, and 3 in terms of specific

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Unformatted text preview: forces. C. [5 pts] What is the acceleration of the system? Block m 1 Block m 2 Block m 3 Block m 1 Block m 2 Block m 3 Name ___________________________________ Student ID ____________ Score_______ last first Physics 131, WI 2009 Exam 2 Q1 Phys131-E2 (2nd law).doc D. [5 pts] What is the tension T 12 (in N) in the string connecting blocks 1 and 2? E. [4 pts] Now suppose that the surface is NOT frictionless. If the coefficient of static friction between the blocks and the surface was μ s = 0.2, will the blocks move or not? Show your work and explain your reasoning....
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