If the sled in the the previous question weighs 530 newtons and the horse pulls it with a force of 140 newtons across level ground at a constant speed, what is the magnitude of the force of friction between the sled rails and the snow?

Question

Hide hint for Question 8

Hint 1: Remember that "level ground at constant speed" are magic words, what do they tell you about the forces?

Hint 2: Be sure you understand the different concepts, "force of friction" and "coefficient of friction". You have enough information to give either of these, but this question merely asks for the force.

Answer 1

constant speed, no acceleration.
pulling force-friction=mass*acceleration