Student 1 (50-kg), sits on a chair with metal runners, at rest. Student 2 (85-kg), sits on an identical chair. Both students keep their feet off the floor. A rope runs from student 1's hands around a light pulley and then over her shoulder to the hands of a teacher standing on the floor behind her. The low friction axle of the pulley is attached to a second rope held by student 2. All ropes run parallel to the chair runners.
a) If student 1 pulls on the end of the rope, will her chair or 2’s chair slide on the floor?
b) If instead the teacher pulls on his rope end, which chair slides? Why this one?
c) If student 2 pulls on his rope which chair slides? Why?
d) Now the teacher ties his end of the rope to student 1’s chair. Student 1 pulls on the end of the rope in her hands. Which chair slides and why.
2. Homework Equations
The Attempt at a Solution
a) Student 1's chair will slide forward then student 2's chair will slide forward as well.
b) Both student 1 and 2's chairs move because there is tension in the rope that pulls on student 1 and that pulley is connected to student 2 as well.
c) Both student 1 and 2 slide forward because when student 2 pulls on his rope he pulls the pulley which increases the tension in the rope of student 1
d) Student A will move first followed by 2
Im not quite sure how to approach this problem and was just trying to reason through it :P Could someone tell me if I'm on the right track? Thank you![/B]
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