Four blocks, A, B, C, and D are stacked and connected by strings m 2 different c

Question

Four blocks, A, B, C, and D are stacked and connected by strings m 2 different cases as shown at right. The hand that is pulling the string connected to block C exerts the same force in both cases. The inertias of the blocks are related as follows: m_A = m_C, m_B = m_D, and m_A > m_B. In both cases, block B does not slide on block A, and block D does not slide on block C. Is the frictional force on block D in a frictional force on block D in case 2? A. Greater than B. Less than C. Equal to D. Not enough information Is the frictional force on block B in case 1 greater than, less than, or equal to the frictional force on block B in case 2? A. Greater than B. Less than C. Equal to D. Not enough information

Explanation / Answer

29. Frictional force on bock D is greater in case 1 since there is direct connection via string between the two blocks B and D. OPTION (a)

30. Frictional force on bock B is greater in case 1 since there is direct connection via string between the two blocks B and D. OPTION (a)

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