These are pictures of me dog sledding a couple spring breaks back in Whistler. It was super duper fun, so if you are in Whistler or anywhere where you can dog sled, I highly recommend it. The dogs are super cute too!
Let's look at the forces on the sled. Because it is on the ground, there is a normal force exerting upwards. They also have weight, which is pulling them to the ground so they don't fly away. Even though these two forces exist, they cancel each other out, so one force isn't acting more than the other one, leaving it balanced. Because the dogs are pulling on the sled, there is tension pulling the sled forward and tension pulling the dogs back. The last force that exists is friction. Friction is what makes the dog sled slow down and come to a stop. Although you cannot see in this picture, the dogs are not keeping a constant velocity, as they constantly accelerate the further they go. This means that tension and friction are unbalanced, because there is more tension making the sled accelerate.
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