Working at the blue cross arena I get to witness many events that all include physics. One of the most obvious ones is hockey. The ice is a surface with very little friction. If you are wearing shoes with little traction it is easy to slide on the ice because of the lack of friction. What this does is allow for the hockey puck to glide across the ice and it will virtually never stop. There is some friction because it is not a completely frictionless surface but the puck would keep going until some force acted on it. In hockey this force would be the players or more specifically the stick.