2. In a physics lab, students observe the block slide up a somewhat rough surface with coefficient of lanetic friction i

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2 In A Physics Lab Students Observe The Block Slide Up A Somewhat Rough Surface With Coefficient Of Lanetic Friction I 1 (55.54 KiB) Viewed 39 times

2. In a physics lab, students observe the block slide up a somewhat rough surface with coefficient of lanetic friction inclined at an angle of above the horizontal. The mass slows, comes to rest for an instant and then Block accelerates back down the incline. -Ramp They argue about how the acceleration of the block sliding up the ramp compares to the acceleration sliding down the ramp Studenti Reasoning: The force of gravity is the only force that can push or pull the block in the downhill direction. Also, since it moves back down the incline, the gravitational force is greater than the friction force." Conclusion: "The acceleration will be greatest when the block is moving down the incline" Student 2: Reasoning "The magnitudes of the forces of friction and gravity act on the block the entire time it is sliding along the incline. Whether the block is going up or down the ramp, the force of gravity has the same magnitude, and the force of friction has the same magnitude." Conclusion: "So the accelerations will be the same." Student 3 Reasoning: "Even though friction and gravity are both always acting, friction is greater when it is slowing down than when it is speeding up. Also, friction acts down the hill on the way up and up the hill on the way back down." Conclusion: "There should be more acceleration on the way up." a) For this part, you will discuss their reasoning ignoring whether the students conclusions are correct or incorrect. Which parts of Student 1's reasoning, if any, are incorrect? Briefly explain. (Writo "Correct", if all is correct) Il Which parts of Student 2's reasoning, if any, are incorrect? Briefly explain. (Write "Correct", if all is correct.) ill. Which parts of Student 3's reasoning, if any, are incorrect? Briefly explain. (Write "Correct", if all is correct.)