- #1
Leo Liu
- 353
- 156
- Homework Statement
- :(
- Relevant Equations
- Rotational Motion, Work-Energy, Impulse
Hi folks! I was teaching myself rotational motion when encountered an example which states as follows:
My questions:
1. I do not understand why pulling the cord moves the rotating spool to the right. There were some discussions on stackexchange (https://physics.stackexchange.com/a/221148/231749), and someone concluded that "Case of rolling without slipping:
In that case the spool would be accelerating to the left (−x−x-direction) and the spool will be rotating anti-clockwise." Could anyone elucidate the motion in this question?
2. I do not really know how to calculate the work done by the tension. It would be great if someone can explain it.
3. I tried to find the friction by calculating the torque, but I did not get the same answer as the textbook. Is it because the torque of the tension exerted on the spool is not always perpendicular to the r?
My work:
Thanks in advance and merry Christmas!
My questions:
1. I do not understand why pulling the cord moves the rotating spool to the right. There were some discussions on stackexchange (https://physics.stackexchange.com/a/221148/231749), and someone concluded that "Case of rolling without slipping:
In that case the spool would be accelerating to the left (−x−x-direction) and the spool will be rotating anti-clockwise." Could anyone elucidate the motion in this question?
2. I do not really know how to calculate the work done by the tension. It would be great if someone can explain it.
3. I tried to find the friction by calculating the torque, but I did not get the same answer as the textbook. Is it because the torque of the tension exerted on the spool is not always perpendicular to the r?
My work:
Thanks in advance and merry Christmas!
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