In the winter sport of curling, players give a 20kg stone a push across a sheet
ID: 2187454 • Letter: I
Question
In the winter sport of curling, players give a 20kg stone a push across a sheet of ice. The stone moves approximately 40m before coming to rest. The final position of the stone in principle only depends on the initial speed at which it is launched and the force of friction between the ice and the stone, but team members can use brooms to sweep the ice in front of the stone to adjust its speed and trajectory a bit; they must do this without touching the stone. Judicious sweeping can lengthen the travel of the stone by 3m . Which of the following statements is correct? 1)The sweepers in a curling competition adjust the trajectory of the stone by decreasing the coefficient of friction between the stone and the ice. 2)The sweepers in a curling competition adjust the trajectory of the stone by increasing the coefficient of friction between the stone and the ice. 3) The sweepers in a curling competition adjust the trajectory of the stone by changing friction from kinetic to static. 4) The sweepers in a curling competition adjust the trajectory of the stone by changing friction from static to kinetic.Explanation / Answer
B)The sweepers in a curling competition adjust the trajectory of the stone by increasing the coefficient of friction between the stone and the ice.