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Gr.12 Physics 30 TextBook *Curling(sport)* question

  1. Feb 8, 2013 #1
    Question: Unit is on Momentum and Impulse
    Experienced Curlers know how to safely stop a moving stone. What do they do and why?




    At first I thought sweeping helps the moving stone stop. But looking around the internet sweeping actually decreases the friction between the stone and the ice by forming water.

    Another idea I had is sweeping caused the stone to travel across more surface area, allowing it to decelerate and stop earlier.

    Do you guys have any ideas?
    Theory?
     
    Last edited: Feb 8, 2013
  2. jcsd
  3. Feb 8, 2013 #2

    Andrew Mason

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    It is not clear what the question is asking. Rocks stop due to ice friction (eg. a "draw to the button" - which is throwing a rock so that it stops at the centre of the circles without hitting a rock). They also stop by hitting another rock squarely and transferring the rock's momentum and energy to another rock.

    Can you explain the physics for this?

    AM
     
  4. Feb 8, 2013 #3
    I asked my teacher today. It wasn't anything complicated about technique, etc. She just wanted me to explain how increasing time can decrease the net force during an impulse. Fnet▲T= impulse. The curler can catch the stone and move with it as the momentum decreases just like how catchers in baseball let their arms fall back when catching a baseball.
     
  5. Feb 9, 2013 #4

    Andrew Mason

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    You should let her know that curler's don't catch stones. They throw them at other stones or get them to slide to a stop. So it is a bad example.

    AM
     
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