AP Physics 1 Question 448: Answer and Explanation
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6. Two masses are attached to a 1 m long massless bar. Mass 1 is 3 kg and is attached to the far left side of the bar. Mass 2 is 5 kg and is attached to the far right side of the bar. If a third mass that is 2 kg is added to the middle of the bar, how does the center of mass of the system change?
- A. The center of mass shifts to the left by 0.025 m.
- B. The center of mass shifts to the right by 0.025 m.
- C. The center of mass shifts to the left by 0.075 m.
- D. The center of mass shifts to the right by 0.075 m.
Correct Answer: A
Start by calculating the center of mass for the system with two masses:
Next, calculate the new center of the mass of the system with the addition of the third mass:
The center of mass of the system has shifted to the left by 0.025 m.