1. The problem statement, all variables and given/known data This is a question about work: There is a dog pulling a sled across a patch of snow *with a force of 20 Newtons*, the dog's mouth is 15 degrees above horizontal and the sled weighs 5Kg. The snow has a coefficient of friction of 0.2, how much work has the dog done once it has covered 20 meters in distance (ignore the weight of the dog)? 2. Relevant equations W = Fd cos(angle) d Where: W is work done Fd is force applied (20 N) angle is angle from horizontal (15 degrees) d is distance (20 meters) Ff = U * N Where: Ff is friction force U is coefficient of friction (0.2) N is normal force 3. The attempt at a solution What I did is: - Calculated the Normal Force (N) - Using N, I calculated the force of friction - Then I calculated the work done by friction (assuming that the angle of the force is 180 degrees) - Then I calculated the work done by the dog pulling the sled (with 15 degree angle above horizontal) - Then I added the two (194 + 386) Result: 580 Joules Am I doing it right? I feel like I'm in the wrong direction. Thanks.