What's causes the 'backspin' while sliding a pencil along a table? [duplicate]Why does a ping pong ball change direction when I spin it on a table?Why do wheels appear to revolve opposite to the direction they are rotating?With Newton's third law, why are things capable of moving?Newton's Third Law of MotionWould a phone move upon vibration in a completely uniform situation?Can I make a rod in the vertical plane move with its one end on the ground in a slanting position?Different directions of frictional force when objects are rollingWeird phenomenon on aluminum laptop casingWhat causes the variable brightness intensity along the filament of an incandescent bulb?Can a gust of wind have a distinct blade-like edge?Rolling Without Slipping and Rotational Energy

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What's causes the 'backspin' while sliding a pencil along a table? [duplicate]


Why does a ping pong ball change direction when I spin it on a table?Why do wheels appear to revolve opposite to the direction they are rotating?With Newton's third law, why are things capable of moving?Newton's Third Law of MotionWould a phone move upon vibration in a completely uniform situation?Can I make a rod in the vertical plane move with its one end on the ground in a slanting position?Different directions of frictional force when objects are rollingWeird phenomenon on aluminum laptop casingWhat causes the variable brightness intensity along the filament of an incandescent bulb?Can a gust of wind have a distinct blade-like edge?Rolling Without Slipping and Rotational Energy













5












$begingroup$



This question already has an answer here:



  • Why does a ping pong ball change direction when I spin it on a table?

    4 answers



A GIF of the described behavior



I've always thought it was weird that pencils act like this: if one pulls their finger along the side of a pencil until it touches the surface below, the pencil is launched in the opposite direction of the way that the finger moved. Why is this?










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marked as duplicate by Qmechanic Apr 27 at 19:04


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

















  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/16271/2451 and links therein.
    $endgroup$
    – Qmechanic
    Apr 27 at 19:04















5












$begingroup$



This question already has an answer here:



  • Why does a ping pong ball change direction when I spin it on a table?

    4 answers



A GIF of the described behavior



I've always thought it was weird that pencils act like this: if one pulls their finger along the side of a pencil until it touches the surface below, the pencil is launched in the opposite direction of the way that the finger moved. Why is this?










share|cite|improve this question









New contributor




Stormblessed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$



marked as duplicate by Qmechanic Apr 27 at 19:04


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

















  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/16271/2451 and links therein.
    $endgroup$
    – Qmechanic
    Apr 27 at 19:04













5












5








5





$begingroup$



This question already has an answer here:



  • Why does a ping pong ball change direction when I spin it on a table?

    4 answers



A GIF of the described behavior



I've always thought it was weird that pencils act like this: if one pulls their finger along the side of a pencil until it touches the surface below, the pencil is launched in the opposite direction of the way that the finger moved. Why is this?










share|cite|improve this question









New contributor




Stormblessed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$





This question already has an answer here:



  • Why does a ping pong ball change direction when I spin it on a table?

    4 answers



A GIF of the described behavior



I've always thought it was weird that pencils act like this: if one pulls their finger along the side of a pencil until it touches the surface below, the pencil is launched in the opposite direction of the way that the finger moved. Why is this?





This question already has an answer here:



  • Why does a ping pong ball change direction when I spin it on a table?

    4 answers







newtonian-mechanics forces rotational-dynamics everyday-life






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edited Apr 27 at 18:14









Rishi

3,74972442




3,74972442






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asked Apr 27 at 14:10









StormblessedStormblessed

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1294




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New contributor





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Check out our Code of Conduct.






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marked as duplicate by Qmechanic Apr 27 at 19:04


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.









marked as duplicate by Qmechanic Apr 27 at 19:04


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.













  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/16271/2451 and links therein.
    $endgroup$
    – Qmechanic
    Apr 27 at 19:04
















  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/16271/2451 and links therein.
    $endgroup$
    – Qmechanic
    Apr 27 at 19:04















$begingroup$
Possible duplicates: physics.stackexchange.com/q/16271/2451 and links therein.
$endgroup$
– Qmechanic
Apr 27 at 19:04




$begingroup$
Possible duplicates: physics.stackexchange.com/q/16271/2451 and links therein.
$endgroup$
– Qmechanic
Apr 27 at 19:04










2 Answers
2






active

oldest

votes


















3












$begingroup$

The sequence of events is shown below.



enter image description here



Initially the pencil is propelled forward with speed $v_rm A$ but has backspin $omega_rm A$ (anticlockwise rotation) so there is relative movement between the pencil and the surface as $v_rm A ne romega_rm A$ where $r$ is the radius of the pencil.



A kinetic friction force acts which reduces the rotational speed of the pencil $omega_rm B$ until there is no rotation of the pencil $omega_rm C=0$ but the pencil is still moving forward $v_rm C$.



The frictional force then starts the pencil rotating clockwise with increasing angular speed and eventually the no slip condition, $v_rm D = romega_rm D$, is reached.






share|cite|improve this answer









$endgroup$




















    0












    $begingroup$

    As the finger comes down the side of the pencil, two things happen:



    A compression that imparts a horizontal force taking the pencil away from the finger



    And a rotation that causes the pencil to rotate tending to bring the pencil back to the start point



    These combine to define how far the pencil travels before it stops.



    The use of spin can be seen on a snooker or billiards table : top, bottom and side...






    share|cite|improve this answer








    New contributor




    Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






    $endgroup$



















      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      3












      $begingroup$

      The sequence of events is shown below.



      enter image description here



      Initially the pencil is propelled forward with speed $v_rm A$ but has backspin $omega_rm A$ (anticlockwise rotation) so there is relative movement between the pencil and the surface as $v_rm A ne romega_rm A$ where $r$ is the radius of the pencil.



      A kinetic friction force acts which reduces the rotational speed of the pencil $omega_rm B$ until there is no rotation of the pencil $omega_rm C=0$ but the pencil is still moving forward $v_rm C$.



      The frictional force then starts the pencil rotating clockwise with increasing angular speed and eventually the no slip condition, $v_rm D = romega_rm D$, is reached.






      share|cite|improve this answer









      $endgroup$

















        3












        $begingroup$

        The sequence of events is shown below.



        enter image description here



        Initially the pencil is propelled forward with speed $v_rm A$ but has backspin $omega_rm A$ (anticlockwise rotation) so there is relative movement between the pencil and the surface as $v_rm A ne romega_rm A$ where $r$ is the radius of the pencil.



        A kinetic friction force acts which reduces the rotational speed of the pencil $omega_rm B$ until there is no rotation of the pencil $omega_rm C=0$ but the pencil is still moving forward $v_rm C$.



        The frictional force then starts the pencil rotating clockwise with increasing angular speed and eventually the no slip condition, $v_rm D = romega_rm D$, is reached.






        share|cite|improve this answer









        $endgroup$















          3












          3








          3





          $begingroup$

          The sequence of events is shown below.



          enter image description here



          Initially the pencil is propelled forward with speed $v_rm A$ but has backspin $omega_rm A$ (anticlockwise rotation) so there is relative movement between the pencil and the surface as $v_rm A ne romega_rm A$ where $r$ is the radius of the pencil.



          A kinetic friction force acts which reduces the rotational speed of the pencil $omega_rm B$ until there is no rotation of the pencil $omega_rm C=0$ but the pencil is still moving forward $v_rm C$.



          The frictional force then starts the pencil rotating clockwise with increasing angular speed and eventually the no slip condition, $v_rm D = romega_rm D$, is reached.






          share|cite|improve this answer









          $endgroup$



          The sequence of events is shown below.



          enter image description here



          Initially the pencil is propelled forward with speed $v_rm A$ but has backspin $omega_rm A$ (anticlockwise rotation) so there is relative movement between the pencil and the surface as $v_rm A ne romega_rm A$ where $r$ is the radius of the pencil.



          A kinetic friction force acts which reduces the rotational speed of the pencil $omega_rm B$ until there is no rotation of the pencil $omega_rm C=0$ but the pencil is still moving forward $v_rm C$.



          The frictional force then starts the pencil rotating clockwise with increasing angular speed and eventually the no slip condition, $v_rm D = romega_rm D$, is reached.







          share|cite|improve this answer












          share|cite|improve this answer



          share|cite|improve this answer










          answered Apr 27 at 17:08









          FarcherFarcher

          52.6k340112




          52.6k340112





















              0












              $begingroup$

              As the finger comes down the side of the pencil, two things happen:



              A compression that imparts a horizontal force taking the pencil away from the finger



              And a rotation that causes the pencil to rotate tending to bring the pencil back to the start point



              These combine to define how far the pencil travels before it stops.



              The use of spin can be seen on a snooker or billiards table : top, bottom and side...






              share|cite|improve this answer








              New contributor




              Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
              Check out our Code of Conduct.






              $endgroup$

















                0












                $begingroup$

                As the finger comes down the side of the pencil, two things happen:



                A compression that imparts a horizontal force taking the pencil away from the finger



                And a rotation that causes the pencil to rotate tending to bring the pencil back to the start point



                These combine to define how far the pencil travels before it stops.



                The use of spin can be seen on a snooker or billiards table : top, bottom and side...






                share|cite|improve this answer








                New contributor




                Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                Check out our Code of Conduct.






                $endgroup$















                  0












                  0








                  0





                  $begingroup$

                  As the finger comes down the side of the pencil, two things happen:



                  A compression that imparts a horizontal force taking the pencil away from the finger



                  And a rotation that causes the pencil to rotate tending to bring the pencil back to the start point



                  These combine to define how far the pencil travels before it stops.



                  The use of spin can be seen on a snooker or billiards table : top, bottom and side...






                  share|cite|improve this answer








                  New contributor




                  Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.






                  $endgroup$



                  As the finger comes down the side of the pencil, two things happen:



                  A compression that imparts a horizontal force taking the pencil away from the finger



                  And a rotation that causes the pencil to rotate tending to bring the pencil back to the start point



                  These combine to define how far the pencil travels before it stops.



                  The use of spin can be seen on a snooker or billiards table : top, bottom and side...







                  share|cite|improve this answer








                  New contributor




                  Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.









                  share|cite|improve this answer



                  share|cite|improve this answer






                  New contributor




                  Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.









                  answered Apr 27 at 14:18









                  Solar MikeSolar Mike

                  1274




                  1274




                  New contributor




                  Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.





                  New contributor





                  Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.






                  Solar Mike is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.













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