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

1. Feb 8, 2013

elmosworld403

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. Feb 8, 2013

Andrew Mason

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

3. Feb 8, 2013

elmosworld403

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.

4. Feb 9, 2013

Andrew Mason

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