The two blocks shown above have different masses and are connected by a string o
ID: 1624267 • Letter: T
Question
The two blocks shown above have different masses and are connected by a string of negligible mass that passes over a fixed wooden beam. The two-block system is released from rest, and the heavier block accelerates as it moves downward. Does the center of mass of the two-block system move, and why or why not? (A) Yes, because the center of mass must always move if the components of the system move. (B) Yes, because the center of mass will always be closer to the more massive block. (C) No, because the blocks move in opposite directions. (D) No, because the blocks move at the same speed. Two new blocks with equal mass now replace the original blocks. The blocks are given an initial speed of 0.56 m/s. The graph above shows their measured speed as a function of time as they continue to move. Is gravity the cause of the blocks' acceleration, and why or why not? (A) Yes, because the graph is linear, so there is a constant acceleration. (B) Yes, because the magnitude of the blocks acceleration is about 10 m/s^2. (C) No, because the gravitational force exerted on each block is the same. (D) No, because gravity can only increase the speed of a system.Explanation / Answer
Answer to Question Number 19 is "A"
Center of Mass of Two block System move because the center of mass must always move if the components of the system move.
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