The dog slowed down and stop because of the high magnitude of friction opposing the motion due to the nature of the grass and dirt.
Friction is a force that opposes motion. It depends on the nature of the surface in contact with the moving object.
Given that a dog sleigh driver prepared for her race. Her sleigh was loaded with equipment, but on snow and ice, the dogs moved the heavy sled with a force of 600 N each. On the snow and ice, the opposing force known as friction is small.
During the race, she came to an area of grass and dirt instead snow. The sled slowed to a stop because of the high magnitude of the opposing force or frictional force due to the nature of the grass and dirt.
Therefore, there is nothing wrong with one of the dogs. One of them is pulling with a net force of less than 600 N because of drastic increase in frictional force due to the nature of grass and dirt.
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